| [9] | 1 | #define Extern extern
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| 2 | #include <sys/types.h>
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| 3 | #include <signal.h>
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| 4 | #include <errno.h>
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| 5 | #include <setjmp.h>
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| 6 | #include "sh.h"
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| 7 | /* -------- sh.c -------- */
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| 8 | /*
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| 9 | * shell
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| 10 | */
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| 11 |
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| 12 | /* #include "sh.h" */
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| 13 |
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| 14 | int intr;
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| 15 | int inparse;
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| 16 | char flags['z'-'a'+1];
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| 17 | char *flag = flags-'a';
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| 18 | char *elinep = line+sizeof(line)-5;
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| 19 | char *null = "";
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| 20 | int heedint =1;
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| 21 | struct env e ={line, iostack, iostack-1,
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| 22 | (xint *)NULL, FDBASE, (struct env *)NULL};
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| 23 |
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| 24 | extern char **environ; /* environment pointer */
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| 25 |
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| 26 | /*
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| 27 | * default shell, search rules
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| 28 | */
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| 29 | char shellname[] = "/bin/sh";
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| 30 | char search[] = ":/bin:/usr/bin";
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| 31 |
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| 32 | _PROTOTYPE(void (*qflag), (int)) = SIG_IGN;
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| 33 |
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| 34 | _PROTOTYPE(int main, (int argc, char **argv ));
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| 35 | _PROTOTYPE(int newfile, (char *s ));
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| 36 | _PROTOTYPE(static char *findeq, (char *cp ));
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| 37 | _PROTOTYPE(static char *cclass, (char *p, int sub ));
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| 38 | _PROTOTYPE(void initarea, (void));
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| 39 |
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| 40 | int main(argc, argv)
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| 41 | int argc;
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| 42 | register char **argv;
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| 43 | {
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| 44 | register int f;
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| 45 | register char *s;
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| 46 | int cflag;
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| 47 | char *name, **ap;
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| 48 | int (*iof)();
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| 49 |
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| 50 | initarea();
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| 51 | if ((ap = environ) != NULL) {
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| 52 | while (*ap)
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| 53 | assign(*ap++, !COPYV);
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| 54 | for (ap = environ; *ap;)
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| 55 | export(lookup(*ap++));
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| 56 | }
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| 57 | closeall();
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| 58 | areanum = 1;
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| 59 |
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| 60 | shell = lookup("SHELL");
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| 61 | if (shell->value == null)
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| 62 | setval(shell, shellname);
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| 63 | export(shell);
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| 64 |
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| 65 | homedir = lookup("HOME");
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| 66 | if (homedir->value == null)
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| 67 | setval(homedir, "/");
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| 68 | export(homedir);
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| 69 |
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| 70 | setval(lookup("$"), itoa(getpid(), 5));
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| 71 |
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| 72 | path = lookup("PATH");
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| 73 | if (path->value == null)
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| 74 | setval(path, search);
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| 75 | export(path);
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| 76 |
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| 77 | ifs = lookup("IFS");
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| 78 | if (ifs->value == null)
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| 79 | setval(ifs, " \t\n");
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| 80 |
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| 81 | prompt = lookup("PS1");
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| 82 | if (prompt->value == null)
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| 83 | #ifndef UNIXSHELL
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| 84 | setval(prompt, "$ ");
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| 85 | #else
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| 86 | setval(prompt, "% ");
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| 87 | #endif
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| 88 |
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| 89 | if (geteuid() == 0) {
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| 90 | setval(prompt, "# ");
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| 91 | prompt->status &= ~EXPORT;
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| 92 | }
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| 93 | cprompt = lookup("PS2");
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| 94 | if (cprompt->value == null)
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| 95 | setval(cprompt, "> ");
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| 96 |
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| 97 | iof = filechar;
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| 98 | cflag = 0;
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| 99 | name = *argv++;
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| 100 | if (--argc >= 1) {
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| 101 | if(argv[0][0] == '-' && argv[0][1] != '\0') {
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| 102 | for (s = argv[0]+1; *s; s++)
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| 103 | switch (*s) {
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| 104 | case 'c':
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| 105 | prompt->status &= ~EXPORT;
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| 106 | cprompt->status &= ~EXPORT;
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| 107 | setval(prompt, "");
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| 108 | setval(cprompt, "");
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| 109 | cflag = 1;
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| 110 | if (--argc > 0)
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| 111 | PUSHIO(aword, *++argv, iof = nlchar);
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| 112 | break;
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| 113 |
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| 114 | case 'q':
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| 115 | qflag = SIG_DFL;
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| 116 | break;
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| 117 |
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| 118 | case 's':
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| 119 | /* standard input */
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| 120 | break;
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| 121 |
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| 122 | case 't':
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| 123 | prompt->status &= ~EXPORT;
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| 124 | setval(prompt, "");
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| 125 | iof = linechar;
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| 126 | break;
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| 127 |
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| 128 | case 'i':
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| 129 | talking++;
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| 130 | default:
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| 131 | if (*s>='a' && *s<='z')
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| 132 | flag[*s]++;
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| 133 | }
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| 134 | } else {
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| 135 | argv--;
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| 136 | argc++;
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| 137 | }
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| 138 | if (iof == filechar && --argc > 0) {
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| 139 | setval(prompt, "");
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| 140 | setval(cprompt, "");
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| 141 | prompt->status &= ~EXPORT;
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| 142 | cprompt->status &= ~EXPORT;
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| 143 | if (newfile(name = *++argv))
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| 144 | exit(1);
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| 145 | }
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| 146 | }
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| 147 | setdash();
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| 148 | if (e.iop < iostack) {
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| 149 | PUSHIO(afile, 0, iof);
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| 150 | if (isatty(0) && isatty(1) && !cflag)
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| 151 | talking++;
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| 152 | }
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| 153 | signal(SIGQUIT, qflag);
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| 154 | if (name && name[0] == '-') {
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| 155 | talking++;
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| 156 | if ((f = open(".profile", 0)) >= 0)
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| 157 | next(remap(f));
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| 158 | if ((f = open("/etc/profile", 0)) >= 0)
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| 159 | next(remap(f));
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| 160 | }
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| 161 | if (talking)
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| 162 | signal(SIGTERM, sig);
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| 163 | if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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| 164 | signal(SIGINT, onintr);
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| 165 | dolv = argv;
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| 166 | dolc = argc;
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| 167 | dolv[0] = name;
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| 168 | if (dolc > 1)
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| 169 | for (ap = ++argv; --argc > 0;)
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| 170 | if (assign(*ap = *argv++, !COPYV))
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| 171 | dolc--; /* keyword */
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| 172 | else
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| 173 | ap++;
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| 174 | setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
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| 175 |
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| 176 | for (;;) {
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| 177 | if (talking && e.iop <= iostack)
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| 178 | prs(prompt->value);
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| 179 | onecommand();
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| 180 | }
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| 181 | }
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| 182 |
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| 183 | void
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| 184 | setdash()
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| 185 | {
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| 186 | register char *cp, c;
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| 187 | char m['z'-'a'+1];
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| 188 |
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| 189 | cp = m;
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| 190 | for (c='a'; c<='z'; c++)
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| 191 | if (flag[c])
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| 192 | *cp++ = c;
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| 193 | *cp = 0;
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| 194 | setval(lookup("-"), m);
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| 195 | }
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| 196 |
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| 197 | int
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| 198 | newfile(s)
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| 199 | register char *s;
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| 200 | {
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| 201 | register f;
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| 202 |
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| 203 | if (strcmp(s, "-") != 0) {
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| 204 | f = open(s, 0);
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| 205 | if (f < 0) {
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| 206 | prs(s);
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| 207 | err(": cannot open");
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| 208 | return(1);
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| 209 | }
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| 210 | } else
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| 211 | f = 0;
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| 212 | next(remap(f));
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| 213 | return(0);
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| 214 | }
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| 215 |
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| 216 | void
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| 217 | onecommand()
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| 218 | {
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| 219 | register i;
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| 220 | jmp_buf m1;
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| 221 |
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| 222 | while (e.oenv)
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| 223 | quitenv();
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| 224 | areanum = 1;
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| 225 | freehere(areanum);
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| 226 | freearea(areanum);
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| 227 | garbage();
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| 228 | wdlist = 0;
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| 229 | iolist = 0;
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| 230 | e.errpt = 0;
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| 231 | e.linep = line;
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| 232 | yynerrs = 0;
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| 233 | multiline = 0;
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| 234 | inparse = 1;
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| 235 | intr = 0;
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| 236 | execflg = 0;
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| 237 | setjmp(failpt = m1); /* Bruce Evans' fix */
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| 238 | if (setjmp(failpt = m1) || yyparse() || intr) {
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| 239 | while (e.oenv)
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| 240 | quitenv();
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| 241 | scraphere();
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| 242 | if (!talking && intr)
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| 243 | leave();
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| 244 | inparse = 0;
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| 245 | intr = 0;
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| 246 | return;
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| 247 | }
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| 248 | inparse = 0;
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| 249 | brklist = 0;
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| 250 | intr = 0;
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| 251 | execflg = 0;
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| 252 | if (!flag['n'])
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| 253 | execute(outtree, NOPIPE, NOPIPE, 0);
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| 254 | if (!talking && intr) {
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| 255 | execflg = 0;
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| 256 | leave();
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| 257 | }
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| 258 | if ((i = trapset) != 0) {
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| 259 | trapset = 0;
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| 260 | runtrap(i);
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| 261 | }
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| 262 | }
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| 263 |
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| 264 | void
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| 265 | fail()
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| 266 | {
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| 267 | longjmp(failpt, 1);
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| 268 | /* NOTREACHED */
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| 269 | }
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| 270 |
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| 271 | void
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| 272 | leave()
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| 273 | {
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| 274 | if (execflg)
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| 275 | fail();
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| 276 | scraphere();
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| 277 | freehere(1);
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| 278 | runtrap(0);
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| 279 | exit(exstat);
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| 280 | /* NOTREACHED */
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| 281 | }
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| 282 |
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| 283 | void
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| 284 | warn(s)
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| 285 | register char *s;
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| 286 | {
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| 287 | if(*s) {
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| 288 | prs(s);
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| 289 | exstat = -1;
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| 290 | }
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| 291 | prs("\n");
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| 292 | if (flag['e'])
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| 293 | leave();
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| 294 | }
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| 295 |
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| 296 | void
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| 297 | err(s)
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| 298 | char *s;
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| 299 | {
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| 300 | warn(s);
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| 301 | if (flag['n'])
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| 302 | return;
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| 303 | if (!talking)
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| 304 | leave();
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| 305 | if (e.errpt)
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| 306 | longjmp(e.errpt, 1);
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| 307 | closeall();
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| 308 | e.iop = e.iobase = iostack;
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| 309 | }
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| 310 |
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| 311 | int
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| 312 | newenv(f)
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| 313 | int f;
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| 314 | {
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| 315 | register struct env *ep;
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| 316 |
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| 317 | if (f) {
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| 318 | quitenv();
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| 319 | return(1);
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| 320 | }
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| 321 | ep = (struct env *) space(sizeof(*ep));
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| 322 | if (ep == NULL) {
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| 323 | while (e.oenv)
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| 324 | quitenv();
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| 325 | fail();
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| 326 | }
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| 327 | *ep = e;
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| 328 | e.oenv = ep;
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| 329 | e.errpt = errpt;
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| 330 | return(0);
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| 331 | }
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| 332 |
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| 333 | void
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| 334 | quitenv()
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| 335 | {
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| 336 | register struct env *ep;
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| 337 | register fd;
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| 338 |
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| 339 | if ((ep = e.oenv) != NULL) {
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| 340 | fd = e.iofd;
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| 341 | e = *ep;
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| 342 | /* should close `'d files */
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| 343 | DELETE(ep);
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| 344 | while (--fd >= e.iofd)
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| 345 | close(fd);
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| 346 | }
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| 347 | }
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| 348 |
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| 349 | /*
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| 350 | * Is any character from s1 in s2?
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| 351 | */
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| 352 | int
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| 353 | anys(s1, s2)
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| 354 | register char *s1, *s2;
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| 355 | {
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| 356 | while (*s1)
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| 357 | if (any(*s1++, s2))
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| 358 | return(1);
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| 359 | return(0);
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| 360 | }
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| 361 |
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| 362 | /*
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| 363 | * Is character c in s?
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| 364 | */
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| 365 | int
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| 366 | any(c, s)
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| 367 | register int c;
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| 368 | register char *s;
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| 369 | {
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| 370 | while (*s)
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| 371 | if (*s++ == c)
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| 372 | return(1);
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| 373 | return(0);
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| 374 | }
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| 375 |
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| 376 | char *
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| 377 | putn(n)
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| 378 | register int n;
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| 379 | {
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| 380 | return(itoa(n, -1));
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| 381 | }
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| 382 |
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| 383 | char *
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| 384 | itoa(u, n)
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| 385 | register unsigned u;
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| 386 | int n;
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| 387 | {
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| 388 | register char *cp;
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| 389 | static char s[20];
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| 390 | int m;
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| 391 |
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| 392 | m = 0;
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| 393 | if (n < 0 && (int) u < 0) {
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| 394 | m++;
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| 395 | u = -u;
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| 396 | }
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| 397 | cp = s+sizeof(s);
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| 398 | *--cp = 0;
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| 399 | do {
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| 400 | *--cp = u%10 + '0';
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| 401 | u /= 10;
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| 402 | } while (--n > 0 || u);
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| 403 | if (m)
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| 404 | *--cp = '-';
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| 405 | return(cp);
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| 406 | }
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| 407 |
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| 408 | void
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| 409 | next(f)
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| 410 | int f;
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| 411 | {
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| 412 | PUSHIO(afile, f, filechar);
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| 413 | }
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| 414 |
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| 415 | void
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| 416 | onintr(s)
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| 417 | int s; /* ANSI C requires a parameter */
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| 418 | {
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| 419 | signal(SIGINT, onintr);
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| 420 | intr = 1;
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| 421 | if (talking) {
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| 422 | if (inparse) {
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| 423 | prs("\n");
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| 424 | fail();
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| 425 | }
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| 426 | }
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| 427 | else if (heedint) {
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| 428 | execflg = 0;
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| 429 | leave();
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| 430 | }
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| 431 | }
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| 432 |
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| 433 | int
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| 434 | letter(c)
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| 435 | register c;
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| 436 | {
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| 437 | return((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_');
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| 438 | }
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| 439 |
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| 440 | int
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| 441 | digit(c)
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| 442 | register c;
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| 443 | {
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| 444 | return(c >= '0' && c <= '9');
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| 445 | }
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| 446 |
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| 447 | int
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| 448 | letnum(c)
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| 449 | register c;
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| 450 | {
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| 451 | return(letter(c) || digit(c));
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| 452 | }
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| 453 |
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| 454 | char *
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| 455 | space(n)
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| 456 | int n;
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| 457 | {
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| 458 | register char *cp;
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| 459 |
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| 460 | if ((cp = getcell(n)) == 0)
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| 461 | err("out of string space");
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| 462 | return(cp);
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| 463 | }
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| 464 |
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| 465 | char *
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| 466 | strsave(s, a)
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| 467 | register char *s;
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| 468 | int a;
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| 469 | {
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| 470 | register char *cp, *xp;
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| 471 |
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| 472 | if ((cp = space(strlen(s)+1)) != NULL) {
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| 473 | setarea((char *)cp, a);
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| 474 | for (xp = cp; (*xp++ = *s++) != '\0';)
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| 475 | ;
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| 476 | return(cp);
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| 477 | }
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| 478 | return("");
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| 479 | }
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| 480 |
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| 481 | void
|
|---|
| 482 | xfree(s)
|
|---|
| 483 | register char *s;
|
|---|
| 484 | {
|
|---|
| 485 | DELETE(s);
|
|---|
| 486 | }
|
|---|
| 487 |
|
|---|
| 488 | /*
|
|---|
| 489 | * trap handling
|
|---|
| 490 | */
|
|---|
| 491 | void
|
|---|
| 492 | sig(i)
|
|---|
| 493 | register int i;
|
|---|
| 494 | {
|
|---|
| 495 | trapset = i;
|
|---|
| 496 | signal(i, sig);
|
|---|
| 497 | }
|
|---|
| 498 |
|
|---|
| 499 | void runtrap(i)
|
|---|
| 500 | int i;
|
|---|
| 501 | {
|
|---|
| 502 | char *trapstr;
|
|---|
| 503 |
|
|---|
| 504 | if ((trapstr = trap[i]) == NULL)
|
|---|
| 505 | return;
|
|---|
| 506 | if (i == 0)
|
|---|
| 507 | trap[i] = 0;
|
|---|
| 508 | RUN(aword, trapstr, nlchar);
|
|---|
| 509 | }
|
|---|
| 510 |
|
|---|
| 511 | /* -------- var.c -------- */
|
|---|
| 512 | /* #include "sh.h" */
|
|---|
| 513 |
|
|---|
| 514 | /*
|
|---|
| 515 | * Find the given name in the dictionary
|
|---|
| 516 | * and return its value. If the name was
|
|---|
| 517 | * not previously there, enter it now and
|
|---|
| 518 | * return a null value.
|
|---|
| 519 | */
|
|---|
| 520 | struct var *
|
|---|
| 521 | lookup(n)
|
|---|
| 522 | register char *n;
|
|---|
| 523 | {
|
|---|
| 524 | register struct var *vp;
|
|---|
| 525 | register char *cp;
|
|---|
| 526 | register int c;
|
|---|
| 527 | static struct var dummy;
|
|---|
| 528 |
|
|---|
| 529 | if (digit(*n)) {
|
|---|
| 530 | dummy.name = n;
|
|---|
| 531 | for (c = 0; digit(*n) && c < 1000; n++)
|
|---|
| 532 | c = c*10 + *n-'0';
|
|---|
| 533 | dummy.status = RONLY;
|
|---|
| 534 | dummy.value = c <= dolc? dolv[c]: null;
|
|---|
| 535 | return(&dummy);
|
|---|
| 536 | }
|
|---|
| 537 | for (vp = vlist; vp; vp = vp->next)
|
|---|
| 538 | if (eqname(vp->name, n))
|
|---|
| 539 | return(vp);
|
|---|
| 540 | cp = findeq(n);
|
|---|
| 541 | vp = (struct var *)space(sizeof(*vp));
|
|---|
| 542 | if (vp == 0 || (vp->name = space((int)(cp-n)+2)) == 0) {
|
|---|
| 543 | dummy.name = dummy.value = "";
|
|---|
| 544 | return(&dummy);
|
|---|
| 545 | }
|
|---|
| 546 | for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++)
|
|---|
| 547 | ;
|
|---|
| 548 | if (*cp == 0)
|
|---|
| 549 | *cp = '=';
|
|---|
| 550 | *++cp = 0;
|
|---|
| 551 | setarea((char *)vp, 0);
|
|---|
| 552 | setarea((char *)vp->name, 0);
|
|---|
| 553 | vp->value = null;
|
|---|
| 554 | vp->next = vlist;
|
|---|
| 555 | vp->status = GETCELL;
|
|---|
| 556 | vlist = vp;
|
|---|
| 557 | return(vp);
|
|---|
| 558 | }
|
|---|
| 559 |
|
|---|
| 560 | /*
|
|---|
| 561 | * give variable at `vp' the value `val'.
|
|---|
| 562 | */
|
|---|
| 563 | void
|
|---|
| 564 | setval(vp, val)
|
|---|
| 565 | struct var *vp;
|
|---|
| 566 | char *val;
|
|---|
| 567 | {
|
|---|
| 568 | nameval(vp, val, (char *)NULL);
|
|---|
| 569 | }
|
|---|
| 570 |
|
|---|
| 571 | /*
|
|---|
| 572 | * if name is not NULL, it must be
|
|---|
| 573 | * a prefix of the space `val',
|
|---|
| 574 | * and end with `='.
|
|---|
| 575 | * this is all so that exporting
|
|---|
| 576 | * values is reasonably painless.
|
|---|
| 577 | */
|
|---|
| 578 | void
|
|---|
| 579 | nameval(vp, val, name)
|
|---|
| 580 | register struct var *vp;
|
|---|
| 581 | char *val, *name;
|
|---|
| 582 | {
|
|---|
| 583 | register char *cp, *xp;
|
|---|
| 584 | char *nv;
|
|---|
| 585 | int fl;
|
|---|
| 586 |
|
|---|
| 587 | if (vp->status & RONLY) {
|
|---|
| 588 | for (xp = vp->name; *xp && *xp != '=';)
|
|---|
| 589 | putc(*xp++);
|
|---|
| 590 | err(" is read-only");
|
|---|
| 591 | return;
|
|---|
| 592 | }
|
|---|
| 593 | fl = 0;
|
|---|
| 594 | if (name == NULL) {
|
|---|
| 595 | xp = space(strlen(vp->name)+strlen(val)+2);
|
|---|
| 596 | if (xp == 0)
|
|---|
| 597 | return;
|
|---|
| 598 | /* make string: name=value */
|
|---|
| 599 | setarea((char *)xp, 0);
|
|---|
| 600 | name = xp;
|
|---|
| 601 | for (cp = vp->name; (*xp = *cp++) && *xp!='='; xp++)
|
|---|
| 602 | ;
|
|---|
| 603 | if (*xp++ == 0)
|
|---|
| 604 | xp[-1] = '=';
|
|---|
| 605 | nv = xp;
|
|---|
| 606 | for (cp = val; (*xp++ = *cp++) != '\0';)
|
|---|
| 607 | ;
|
|---|
| 608 | val = nv;
|
|---|
| 609 | fl = GETCELL;
|
|---|
| 610 | }
|
|---|
| 611 | if (vp->status & GETCELL)
|
|---|
| 612 | xfree(vp->name); /* form new string `name=value' */
|
|---|
| 613 | vp->name = name;
|
|---|
| 614 | vp->value = val;
|
|---|
| 615 | vp->status |= fl;
|
|---|
| 616 | }
|
|---|
| 617 |
|
|---|
| 618 | void
|
|---|
| 619 | export(vp)
|
|---|
| 620 | struct var *vp;
|
|---|
| 621 | {
|
|---|
| 622 | vp->status |= EXPORT;
|
|---|
| 623 | }
|
|---|
| 624 |
|
|---|
| 625 | void
|
|---|
| 626 | ronly(vp)
|
|---|
| 627 | struct var *vp;
|
|---|
| 628 | {
|
|---|
| 629 | if (letter(vp->name[0])) /* not an internal symbol ($# etc) */
|
|---|
| 630 | vp->status |= RONLY;
|
|---|
| 631 | }
|
|---|
| 632 |
|
|---|
| 633 | int
|
|---|
| 634 | isassign(s)
|
|---|
| 635 | register char *s;
|
|---|
| 636 | {
|
|---|
| 637 | if (!letter((int)*s))
|
|---|
| 638 | return(0);
|
|---|
| 639 | for (; *s != '='; s++)
|
|---|
| 640 | if (*s == 0 || !letnum(*s))
|
|---|
| 641 | return(0);
|
|---|
| 642 | return(1);
|
|---|
| 643 | }
|
|---|
| 644 |
|
|---|
| 645 | int
|
|---|
| 646 | assign(s, cf)
|
|---|
| 647 | register char *s;
|
|---|
| 648 | int cf;
|
|---|
| 649 | {
|
|---|
| 650 | register char *cp;
|
|---|
| 651 | struct var *vp;
|
|---|
| 652 |
|
|---|
| 653 | if (!letter(*s))
|
|---|
| 654 | return(0);
|
|---|
| 655 | for (cp = s; *cp != '='; cp++)
|
|---|
| 656 | if (*cp == 0 || !letnum(*cp))
|
|---|
| 657 | return(0);
|
|---|
| 658 | vp = lookup(s);
|
|---|
| 659 | nameval(vp, ++cp, cf == COPYV? (char *)NULL: s);
|
|---|
| 660 | if (cf != COPYV)
|
|---|
| 661 | vp->status &= ~GETCELL;
|
|---|
| 662 | return(1);
|
|---|
| 663 | }
|
|---|
| 664 |
|
|---|
| 665 | int
|
|---|
| 666 | checkname(cp)
|
|---|
| 667 | register char *cp;
|
|---|
| 668 | {
|
|---|
| 669 | if (!letter(*cp++))
|
|---|
| 670 | return(0);
|
|---|
| 671 | while (*cp)
|
|---|
| 672 | if (!letnum(*cp++))
|
|---|
| 673 | return(0);
|
|---|
| 674 | return(1);
|
|---|
| 675 | }
|
|---|
| 676 |
|
|---|
| 677 | void
|
|---|
| 678 | putvlist(f, out)
|
|---|
| 679 | register int f, out;
|
|---|
| 680 | {
|
|---|
| 681 | register struct var *vp;
|
|---|
| 682 |
|
|---|
| 683 | for (vp = vlist; vp; vp = vp->next)
|
|---|
| 684 | if (vp->status & f && letter(*vp->name)) {
|
|---|
| 685 | if (vp->status & EXPORT)
|
|---|
| 686 | write(out, "export ", 7);
|
|---|
| 687 | if (vp->status & RONLY)
|
|---|
| 688 | write(out, "readonly ", 9);
|
|---|
| 689 | write(out, vp->name, (int)(findeq(vp->name) - vp->name));
|
|---|
| 690 | write(out, "\n", 1);
|
|---|
| 691 | }
|
|---|
| 692 | }
|
|---|
| 693 |
|
|---|
| 694 | int
|
|---|
| 695 | eqname(n1, n2)
|
|---|
| 696 | register char *n1, *n2;
|
|---|
| 697 | {
|
|---|
| 698 | for (; *n1 != '=' && *n1 != 0; n1++)
|
|---|
| 699 | if (*n2++ != *n1)
|
|---|
| 700 | return(0);
|
|---|
| 701 | return(*n2 == 0 || *n2 == '=');
|
|---|
| 702 | }
|
|---|
| 703 |
|
|---|
| 704 | static char *
|
|---|
| 705 | findeq(cp)
|
|---|
| 706 | register char *cp;
|
|---|
| 707 | {
|
|---|
| 708 | while (*cp != '\0' && *cp != '=')
|
|---|
| 709 | cp++;
|
|---|
| 710 | return(cp);
|
|---|
| 711 | }
|
|---|
| 712 |
|
|---|
| 713 | /* -------- gmatch.c -------- */
|
|---|
| 714 | /*
|
|---|
| 715 | * int gmatch(string, pattern)
|
|---|
| 716 | * char *string, *pattern;
|
|---|
| 717 | *
|
|---|
| 718 | * Match a pattern as in sh(1).
|
|---|
| 719 | */
|
|---|
| 720 |
|
|---|
| 721 | #define CMASK 0377
|
|---|
| 722 | #define QUOTE 0200
|
|---|
| 723 | #define QMASK (CMASK&~QUOTE)
|
|---|
| 724 | #define NOT '!' /* might use ^ */
|
|---|
| 725 |
|
|---|
| 726 | int
|
|---|
| 727 | gmatch(s, p)
|
|---|
| 728 | register char *s, *p;
|
|---|
| 729 | {
|
|---|
| 730 | register int sc, pc;
|
|---|
| 731 |
|
|---|
| 732 | if (s == NULL || p == NULL)
|
|---|
| 733 | return(0);
|
|---|
| 734 | while ((pc = *p++ & CMASK) != '\0') {
|
|---|
| 735 | sc = *s++ & QMASK;
|
|---|
| 736 | switch (pc) {
|
|---|
| 737 | case '[':
|
|---|
| 738 | if ((p = cclass(p, sc)) == NULL)
|
|---|
| 739 | return(0);
|
|---|
| 740 | break;
|
|---|
| 741 |
|
|---|
| 742 | case '?':
|
|---|
| 743 | if (sc == 0)
|
|---|
| 744 | return(0);
|
|---|
| 745 | break;
|
|---|
| 746 |
|
|---|
| 747 | case '*':
|
|---|
| 748 | s--;
|
|---|
| 749 | do {
|
|---|
| 750 | if (*p == '\0' || gmatch(s, p))
|
|---|
| 751 | return(1);
|
|---|
| 752 | } while (*s++ != '\0');
|
|---|
| 753 | return(0);
|
|---|
| 754 |
|
|---|
| 755 | default:
|
|---|
| 756 | if (sc != (pc&~QUOTE))
|
|---|
| 757 | return(0);
|
|---|
| 758 | }
|
|---|
| 759 | }
|
|---|
| 760 | return(*s == 0);
|
|---|
| 761 | }
|
|---|
| 762 |
|
|---|
| 763 | static char *
|
|---|
| 764 | cclass(p, sub)
|
|---|
| 765 | register char *p;
|
|---|
| 766 | register int sub;
|
|---|
| 767 | {
|
|---|
| 768 | register int c, d, not, found;
|
|---|
| 769 |
|
|---|
| 770 | if ((not = *p == NOT) != 0)
|
|---|
| 771 | p++;
|
|---|
| 772 | found = not;
|
|---|
| 773 | do {
|
|---|
| 774 | if (*p == '\0')
|
|---|
| 775 | return((char *)NULL);
|
|---|
| 776 | c = *p & CMASK;
|
|---|
| 777 | if (p[1] == '-' && p[2] != ']') {
|
|---|
| 778 | d = p[2] & CMASK;
|
|---|
| 779 | p++;
|
|---|
| 780 | } else
|
|---|
| 781 | d = c;
|
|---|
| 782 | if (c == sub || (c <= sub && sub <= d))
|
|---|
| 783 | found = !not;
|
|---|
| 784 | } while (*++p != ']');
|
|---|
| 785 | return(found? p+1: (char *)NULL);
|
|---|
| 786 | }
|
|---|
| 787 |
|
|---|
| 788 | /* -------- area.c -------- */
|
|---|
| 789 | #define REGSIZE sizeof(struct region)
|
|---|
| 790 | #define GROWBY 256
|
|---|
| 791 | #undef SHRINKBY 64
|
|---|
| 792 | #define FREE 32767
|
|---|
| 793 | #define BUSY 0
|
|---|
| 794 | #define ALIGN (sizeof(int)-1)
|
|---|
| 795 |
|
|---|
| 796 | /* #include "area.h" */
|
|---|
| 797 |
|
|---|
| 798 | struct region {
|
|---|
| 799 | struct region *next;
|
|---|
| 800 | int area;
|
|---|
| 801 | };
|
|---|
| 802 |
|
|---|
| 803 | /*
|
|---|
| 804 | * All memory between (char *)areabot and (char *)(areatop+1) is
|
|---|
| 805 | * exclusively administered by the area management routines.
|
|---|
| 806 | * It is assumed that sbrk() and brk() manipulate the high end.
|
|---|
| 807 | */
|
|---|
| 808 | static struct region *areabot; /* bottom of area */
|
|---|
| 809 | static struct region *areatop; /* top of area */
|
|---|
| 810 | static struct region *areanxt; /* starting point of scan */
|
|---|
| 811 |
|
|---|
| 812 | void
|
|---|
| 813 | initarea()
|
|---|
| 814 | {
|
|---|
| 815 | while ((int)sbrk(0) & ALIGN)
|
|---|
| 816 | sbrk(1);
|
|---|
| 817 | areabot = (struct region *)sbrk(REGSIZE);
|
|---|
| 818 | areabot->next = areabot;
|
|---|
| 819 | areabot->area = BUSY;
|
|---|
| 820 | areatop = areabot;
|
|---|
| 821 | areanxt = areabot;
|
|---|
| 822 | }
|
|---|
| 823 |
|
|---|
| 824 | char *
|
|---|
| 825 | getcell(nbytes)
|
|---|
| 826 | unsigned nbytes;
|
|---|
| 827 | {
|
|---|
| 828 | register int nregio;
|
|---|
| 829 | register struct region *p, *q;
|
|---|
| 830 | register i;
|
|---|
| 831 |
|
|---|
| 832 | if (nbytes == 0)
|
|---|
| 833 | abort(); /* silly and defeats the algorithm */
|
|---|
| 834 | /*
|
|---|
| 835 | * round upwards and add administration area
|
|---|
| 836 | */
|
|---|
| 837 | nregio = (nbytes+(REGSIZE-1))/REGSIZE + 1;
|
|---|
| 838 | for (p = areanxt;;) {
|
|---|
| 839 | if (p->area > areanum) {
|
|---|
| 840 | /*
|
|---|
| 841 | * merge free cells
|
|---|
| 842 | */
|
|---|
| 843 | while ((q = p->next)->area > areanum && q != areanxt)
|
|---|
| 844 | p->next = q->next;
|
|---|
| 845 | /*
|
|---|
| 846 | * exit loop if cell big enough
|
|---|
| 847 | */
|
|---|
| 848 | if (q >= p + nregio)
|
|---|
| 849 | goto found;
|
|---|
| 850 | }
|
|---|
| 851 | p = p->next;
|
|---|
| 852 | if (p == areanxt)
|
|---|
| 853 | break;
|
|---|
| 854 | }
|
|---|
| 855 | i = nregio >= GROWBY ? nregio : GROWBY;
|
|---|
| 856 | p = (struct region *)sbrk(i * REGSIZE);
|
|---|
| 857 | if (p == (struct region *)-1)
|
|---|
| 858 | return((char *)NULL);
|
|---|
| 859 | p--;
|
|---|
| 860 | if (p != areatop)
|
|---|
| 861 | abort(); /* allocated areas are contiguous */
|
|---|
| 862 | q = p + i;
|
|---|
| 863 | p->next = q;
|
|---|
| 864 | p->area = FREE;
|
|---|
| 865 | q->next = areabot;
|
|---|
| 866 | q->area = BUSY;
|
|---|
| 867 | areatop = q;
|
|---|
| 868 | found:
|
|---|
| 869 | /*
|
|---|
| 870 | * we found a FREE area big enough, pointed to by 'p', and up to 'q'
|
|---|
| 871 | */
|
|---|
| 872 | areanxt = p + nregio;
|
|---|
| 873 | if (areanxt < q) {
|
|---|
| 874 | /*
|
|---|
| 875 | * split into requested area and rest
|
|---|
| 876 | */
|
|---|
| 877 | if (areanxt+1 > q)
|
|---|
| 878 | abort(); /* insufficient space left for admin */
|
|---|
| 879 | areanxt->next = q;
|
|---|
| 880 | areanxt->area = FREE;
|
|---|
| 881 | p->next = areanxt;
|
|---|
| 882 | }
|
|---|
| 883 | p->area = areanum;
|
|---|
| 884 | return((char *)(p+1));
|
|---|
| 885 | }
|
|---|
| 886 |
|
|---|
| 887 | void
|
|---|
| 888 | freecell(cp)
|
|---|
| 889 | char *cp;
|
|---|
| 890 | {
|
|---|
| 891 | register struct region *p;
|
|---|
| 892 |
|
|---|
| 893 | if ((p = (struct region *)cp) != NULL) {
|
|---|
| 894 | p--;
|
|---|
| 895 | if (p < areanxt)
|
|---|
| 896 | areanxt = p;
|
|---|
| 897 | p->area = FREE;
|
|---|
| 898 | }
|
|---|
| 899 | }
|
|---|
| 900 |
|
|---|
| 901 | void
|
|---|
| 902 | freearea(a)
|
|---|
| 903 | register int a;
|
|---|
| 904 | {
|
|---|
| 905 | register struct region *p, *top;
|
|---|
| 906 |
|
|---|
| 907 | top = areatop;
|
|---|
| 908 | for (p = areabot; p != top; p = p->next)
|
|---|
| 909 | if (p->area >= a)
|
|---|
| 910 | p->area = FREE;
|
|---|
| 911 | }
|
|---|
| 912 |
|
|---|
| 913 | void
|
|---|
| 914 | setarea(cp,a)
|
|---|
| 915 | char *cp;
|
|---|
| 916 | int a;
|
|---|
| 917 | {
|
|---|
| 918 | register struct region *p;
|
|---|
| 919 |
|
|---|
| 920 | if ((p = (struct region *)cp) != NULL)
|
|---|
| 921 | (p-1)->area = a;
|
|---|
| 922 | }
|
|---|
| 923 |
|
|---|
| 924 | int
|
|---|
| 925 | getarea(cp)
|
|---|
| 926 | char *cp;
|
|---|
| 927 | {
|
|---|
| 928 | return ((struct region*)cp-1)->area;
|
|---|
| 929 | }
|
|---|
| 930 |
|
|---|
| 931 | void
|
|---|
| 932 | garbage()
|
|---|
| 933 | {
|
|---|
| 934 | register struct region *p, *q, *top;
|
|---|
| 935 |
|
|---|
| 936 | top = areatop;
|
|---|
| 937 | for (p = areabot; p != top; p = p->next) {
|
|---|
| 938 | if (p->area > areanum) {
|
|---|
| 939 | while ((q = p->next)->area > areanum)
|
|---|
| 940 | p->next = q->next;
|
|---|
| 941 | areanxt = p;
|
|---|
| 942 | }
|
|---|
| 943 | }
|
|---|
| 944 | #ifdef SHRINKBY
|
|---|
| 945 | if (areatop >= q + SHRINKBY && q->area > areanum) {
|
|---|
| 946 | brk((char *)(q+1));
|
|---|
| 947 | q->next = areabot;
|
|---|
| 948 | q->area = BUSY;
|
|---|
| 949 | areatop = q;
|
|---|
| 950 | }
|
|---|
| 951 | #endif
|
|---|
| 952 | }
|
|---|
