| 1 | #include "EXTERN.h"
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| 2 | #include "common.h"
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| 3 | #include "INTERN.h"
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| 4 | #include "util.h"
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| 5 |
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| 6 | /* Rename a file, copying it if necessary. */
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| 7 |
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| 8 | int
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| 9 | move_file(from,to)
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| 10 | char *from, *to;
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| 11 | {
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| 12 | char bakname[512];
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| 13 | Reg1 char *s;
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| 14 | Reg2 int i;
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| 15 | Reg3 int fromfd;
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| 16 |
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| 17 | /* to stdout? */
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| 18 |
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| 19 | if (strEQ(to, "-")) {
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| 20 | #ifdef DEBUGGING
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| 21 | if (debug & 4)
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| 22 | say2("Moving %s to stdout.\n", from);
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| 23 | #endif
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| 24 | fromfd = open(from, 0);
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| 25 | if (fromfd < 0)
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| 26 | fatal2("patch: internal error, can't reopen %s\n", from);
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| 27 | while ((i=read(fromfd, buf, sizeof buf)) > 0)
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| 28 | if (write(1, buf, i) != i)
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| 29 | fatal1("patch: write failed\n");
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| 30 | Close(fromfd);
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| 31 | return 0;
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| 32 | }
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| 33 |
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| 34 | if (origprae) {
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| 35 | Strcpy (bakname, origprae);
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| 36 | Strcat(bakname, to);
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| 37 | } else {
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| 38 | Strcpy(bakname, to);
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| 39 | Strcat(bakname, origext?origext:ORIGEXT);
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| 40 | }
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| 41 | if (stat(to, &filestat) >= 0) { /* output file exists */
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| 42 | dev_t to_device = filestat.st_dev;
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| 43 | ino_t to_inode = filestat.st_ino;
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| 44 | char *simplename = bakname;
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| 45 |
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| 46 | for (s=bakname; *s; s++) {
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| 47 | if (*s == '/')
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| 48 | simplename = s+1;
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| 49 | }
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| 50 | /* find a backup name that is not the same file */
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| 51 | while (stat(bakname, &filestat) >= 0 &&
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| 52 | to_device == filestat.st_dev && to_inode == filestat.st_ino) {
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| 53 | for (s=simplename; *s && !islower(*s); s++) ;
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| 54 | if (*s)
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| 55 | *s = toupper(*s);
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| 56 | else
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| 57 | Strcpy(simplename, simplename+1);
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| 58 | }
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| 59 | while (unlink(bakname) >= 0) ; /* while() is for benefit of Eunice */
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| 60 | #ifdef DEBUGGING
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| 61 | if (debug & 4)
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| 62 | say3("Moving %s to %s.\n", to, bakname);
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| 63 | #endif
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| 64 | if (link(to, bakname) < 0) {
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| 65 | say3("patch: can't backup %s, output is in %s\n",
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| 66 | to, from);
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| 67 | return -1;
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| 68 | }
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| 69 | while (unlink(to) >= 0) ;
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| 70 | }
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| 71 | #ifdef DEBUGGING
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| 72 | if (debug & 4)
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| 73 | say3("Moving %s to %s.\n", from, to);
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| 74 | #endif
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| 75 | if (link(from, to) < 0) { /* different file system? */
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| 76 | Reg4 int tofd;
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| 77 |
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| 78 | tofd = creat(to, 0666);
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| 79 | if (tofd < 0) {
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| 80 | say3("patch: can't create %s, output is in %s.\n",
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| 81 | to, from);
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| 82 | return -1;
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| 83 | }
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| 84 | fromfd = open(from, 0);
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| 85 | if (fromfd < 0)
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| 86 | fatal2("patch: internal error, can't reopen %s\n", from);
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| 87 | while ((i=read(fromfd, buf, sizeof buf)) > 0)
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| 88 | if (write(tofd, buf, i) != i)
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| 89 | fatal1("patch: write failed\n");
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| 90 | Close(fromfd);
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| 91 | Close(tofd);
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| 92 | }
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| 93 | Unlink(from);
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| 94 | return 0;
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| 95 | }
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| 96 |
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| 97 | /* Copy a file. */
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| 98 |
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| 99 | void
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| 100 | copy_file(from,to)
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| 101 | char *from, *to;
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| 102 | {
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| 103 | Reg3 int tofd;
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| 104 | Reg2 int fromfd;
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| 105 | Reg1 int i;
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| 106 |
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| 107 | tofd = creat(to, 0666);
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| 108 | if (tofd < 0)
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| 109 | fatal2("patch: can't create %s.\n", to);
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| 110 | fromfd = open(from, 0);
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| 111 | if (fromfd < 0)
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| 112 | fatal2("patch: internal error, can't reopen %s\n", from);
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| 113 | while ((i=read(fromfd, buf, sizeof buf)) > 0)
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| 114 | if (write(tofd, buf, i) != i)
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| 115 | fatal2("patch: write (%s) failed\n", to);
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| 116 | Close(fromfd);
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| 117 | Close(tofd);
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| 118 | }
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| 119 |
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| 120 | /* Allocate a unique area for a string. */
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| 121 |
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| 122 | char *
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| 123 | savestr(s)
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| 124 | Reg1 char *s;
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| 125 | {
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| 126 | Reg3 char *rv;
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| 127 | Reg2 char *t;
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| 128 |
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| 129 | if (!s)
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| 130 | s = "Oops";
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| 131 | t = s;
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| 132 | while (*t++);
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| 133 | rv = (char *)malloc((MEM) (t - s));
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| 134 | if (rv == Nullch) {
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| 135 | if (using_plan_a)
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| 136 | out_of_mem = TRUE;
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| 137 | else
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| 138 | fatal1("patch: out of memory (savestr)\n");
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| 139 | }
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| 140 | else {
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| 141 | t = rv;
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| 142 | while (*t++ = *s++);
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| 143 | }
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| 144 | return rv;
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| 145 | }
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| 146 |
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| 147 | #if defined(lint) && defined(CANVARARG)
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| 148 |
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| 149 | /*VARARGS ARGSUSED*/
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| 150 | say(pat) char *pat; { ; }
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| 151 | /*VARARGS ARGSUSED*/
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| 152 | fatal(pat) char *pat; { ; }
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| 153 | /*VARARGS ARGSUSED*/
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| 154 | ask(pat) char *pat; { ; }
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| 155 |
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| 156 | #else
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| 157 |
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| 158 | /* Vanilla terminal output (buffered). */
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| 159 |
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| 160 | void
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| 161 | say(pat,arg1,arg2,arg3)
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| 162 | char *pat;
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| 163 | long arg1,arg2,arg3;
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| 164 | {
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| 165 | fprintf(stderr, pat, arg1, arg2, arg3);
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| 166 | Fflush(stderr);
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| 167 | }
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| 168 |
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| 169 | /* Terminal output, pun intended. */
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| 170 |
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| 171 | void /* very void */
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| 172 | fatal(pat,arg1,arg2,arg3)
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| 173 | char *pat;
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| 174 | long arg1,arg2,arg3;
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| 175 | {
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| 176 | say(pat, arg1, arg2, arg3);
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| 177 | my_exit(1);
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| 178 | }
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| 179 |
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| 180 | /* Get a response from the user, somehow or other. */
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| 181 |
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| 182 | void
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| 183 | ask(pat,arg1,arg2,arg3)
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| 184 | char *pat;
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| 185 | long arg1,arg2,arg3;
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| 186 | {
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| 187 | int ttyfd;
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| 188 | int r;
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| 189 | bool tty2 = isatty(2);
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| 190 |
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| 191 | Sprintf(buf, pat, arg1, arg2, arg3);
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| 192 | Fflush(stderr);
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| 193 | write(2, buf, strlen(buf));
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| 194 | if (tty2) { /* might be redirected to a file */
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| 195 | r = read(2, buf, sizeof buf);
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| 196 | }
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| 197 | else if (isatty(1)) { /* this may be new file output */
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| 198 | Fflush(stdout);
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| 199 | write(1, buf, strlen(buf));
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| 200 | r = read(1, buf, sizeof buf);
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| 201 | }
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| 202 | else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
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| 203 | /* might be deleted or unwriteable */
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| 204 | write(ttyfd, buf, strlen(buf));
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| 205 | r = read(ttyfd, buf, sizeof buf);
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| 206 | Close(ttyfd);
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| 207 | }
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| 208 | else if (isatty(0)) { /* this is probably patch input */
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| 209 | Fflush(stdin);
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| 210 | write(0, buf, strlen(buf));
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| 211 | r = read(0, buf, sizeof buf);
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| 212 | }
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| 213 | else { /* no terminal at all--default it */
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| 214 | buf[0] = '\n';
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| 215 | r = 1;
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| 216 | }
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| 217 | if (r <= 0)
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| 218 | buf[0] = 0;
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| 219 | else
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| 220 | buf[r] = '\0';
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| 221 | if (!tty2)
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| 222 | say1(buf);
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| 223 | }
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| 224 | #endif /* lint */
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| 225 |
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| 226 | /* How to handle certain events when not in a critical region. */
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| 227 |
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| 228 | void
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| 229 | set_signals(reset)
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| 230 | int reset;
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| 231 | {
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| 232 | #ifndef lint
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| 233 | #ifdef VOIDSIG
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| 234 | static void (*hupval)(),(*intval)();
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| 235 | #else
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| 236 | static int (*hupval)(),(*intval)();
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| 237 | #endif
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| 238 |
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| 239 | if (!reset) {
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| 240 | hupval = signal(SIGHUP, SIG_IGN);
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| 241 | if (hupval != SIG_IGN)
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| 242 | #ifdef VOIDSIG
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| 243 | hupval = my_exit;
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| 244 | #else
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| 245 | hupval = (int(*)())my_exit;
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| 246 | #endif
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| 247 | intval = signal(SIGINT, SIG_IGN);
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| 248 | if (intval != SIG_IGN)
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| 249 | #ifdef VOIDSIG
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| 250 | intval = my_exit;
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| 251 | #else
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| 252 | intval = (int(*)())my_exit;
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| 253 | #endif
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| 254 | }
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| 255 | Signal(SIGHUP, hupval);
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| 256 | Signal(SIGINT, intval);
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| 257 | #endif
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| 258 | }
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| 259 |
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| 260 | /* How to handle certain events when in a critical region. */
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| 261 |
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| 262 | void
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| 263 | ignore_signals()
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| 264 | {
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| 265 | #ifndef lint
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| 266 | Signal(SIGHUP, SIG_IGN);
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| 267 | Signal(SIGINT, SIG_IGN);
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| 268 | #endif
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| 269 | }
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| 270 |
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| 271 | /* Make sure we'll have the directories to create a file. */
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| 272 |
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| 273 | void
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| 274 | makedirs(filename,striplast)
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| 275 | Reg1 char *filename;
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| 276 | bool striplast;
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| 277 | {
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| 278 | char tmpbuf[256];
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| 279 | Reg2 char *s = tmpbuf;
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| 280 | char *dirv[20];
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| 281 | Reg3 int i;
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| 282 | Reg4 int dirvp = 0;
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| 283 |
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| 284 | while (*filename) {
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| 285 | if (*filename == '/') {
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| 286 | filename++;
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| 287 | dirv[dirvp++] = s;
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| 288 | *s++ = '\0';
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| 289 | }
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| 290 | else {
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| 291 | *s++ = *filename++;
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| 292 | }
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| 293 | }
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| 294 | *s = '\0';
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| 295 | dirv[dirvp] = s;
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| 296 | if (striplast)
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| 297 | dirvp--;
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| 298 | if (dirvp < 0)
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| 299 | return;
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| 300 | strcpy(buf, "mkdir");
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| 301 | s = buf;
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| 302 | for (i=0; i<=dirvp; i++) {
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| 303 | while (*s) s++;
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| 304 | *s++ = ' ';
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| 305 | strcpy(s, tmpbuf);
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| 306 | *dirv[i] = '/';
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| 307 | }
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| 308 | system(buf);
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| 309 | }
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| 310 |
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| 311 | /* Make filenames more reasonable. */
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| 312 |
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| 313 | char *
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| 314 | fetchname(at,strip_leading,assume_exists)
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| 315 | char *at;
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| 316 | int strip_leading;
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| 317 | int assume_exists;
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| 318 | {
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| 319 | char *s;
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| 320 | char *name;
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| 321 | Reg1 char *t;
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| 322 | char tmpbuf[200];
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| 323 |
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| 324 | if (!at)
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| 325 | return Nullch;
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| 326 | s = savestr(at);
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| 327 | for (t=s; isspace(*t); t++) ;
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| 328 | name = t;
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| 329 | #ifdef DEBUGGING
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| 330 | if (debug & 128)
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| 331 | say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
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| 332 | #endif
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| 333 | if (strnEQ(name, "/dev/null", 9)) /* so files can be created by diffing */
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| 334 | return Nullch; /* against /dev/null. */
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| 335 | for (; *t && !isspace(*t); t++)
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| 336 | if (*t == '/')
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| 337 | if (--strip_leading >= 0)
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| 338 | name = t+1;
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| 339 | *t = '\0';
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| 340 | if (name != s && *s != '/') {
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| 341 | name[-1] = '\0';
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| 342 | if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
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| 343 | name[-1] = '/';
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| 344 | name=s;
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| 345 | }
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| 346 | }
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| 347 | name = savestr(name);
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| 348 | Sprintf(tmpbuf, "RCS/%s", name);
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| 349 | free(s);
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| 350 | if (stat(name, &filestat) < 0 && !assume_exists) {
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| 351 | Strcat(tmpbuf, RCSSUFFIX);
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| 352 | if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
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| 353 | Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
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| 354 | if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
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| 355 | free(name);
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| 356 | name = Nullch;
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| 357 | }
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| 358 | }
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| 359 | }
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| 360 | return name;
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| 361 | }
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