| 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 |
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| 8 | /* -------- io.c -------- */
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| 9 | /* #include "sh.h" */
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| 10 |
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| 11 | /*
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| 12 | * shell IO
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| 13 | */
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| 14 |
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| 15 | static struct iobuf sharedbuf = {AFID_NOBUF};
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| 16 | static struct iobuf mainbuf = {AFID_NOBUF};
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| 17 | static unsigned bufid = AFID_ID; /* buffer id counter */
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| 18 |
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| 19 | struct ioarg temparg = {0, 0, 0, AFID_NOBUF, 0};
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| 20 |
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| 21 | _PROTOTYPE(static void readhere, (char **name, char *s, int ec ));
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| 22 | _PROTOTYPE(void pushio, (struct ioarg *argp, int (*fn)()));
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| 23 | _PROTOTYPE(static int xxchar, (struct ioarg *ap ));
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| 24 | _PROTOTYPE(void tempname, (char *tname ));
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| 25 |
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| 26 | int
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| 27 | getc(ec)
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| 28 | register int ec;
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| 29 | {
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| 30 | register int c;
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| 31 |
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| 32 | if(e.linep > elinep) {
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| 33 | while((c=readc()) != '\n' && c)
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| 34 | ;
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| 35 | err("input line too long");
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| 36 | gflg++;
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| 37 | return(c);
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| 38 | }
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| 39 | c = readc();
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| 40 | if (ec != '\'' && e.iop->task != XGRAVE) {
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| 41 | if(c == '\\') {
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| 42 | c = readc();
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| 43 | if (c == '\n' && ec != '\"')
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| 44 | return(getc(ec));
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| 45 | c |= QUOTE;
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| 46 | }
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| 47 | }
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| 48 | return(c);
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| 49 | }
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| 50 |
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| 51 | void
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| 52 | unget(c)
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| 53 | int c;
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| 54 | {
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| 55 | if (e.iop >= e.iobase)
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| 56 | e.iop->peekc = c;
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| 57 | }
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| 58 |
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| 59 | int
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| 60 | eofc()
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| 61 |
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| 62 | {
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| 63 | return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0);
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| 64 | }
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| 65 |
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| 66 | int
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| 67 | readc()
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| 68 | {
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| 69 | register c;
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| 70 |
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| 71 | for (; e.iop >= e.iobase; e.iop--)
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| 72 | if ((c = e.iop->peekc) != '\0') {
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| 73 | e.iop->peekc = 0;
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| 74 | return(c);
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| 75 | }
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| 76 | else {
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| 77 | if (e.iop->prev != 0) {
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| 78 | if ((c = (*e.iop->iofn)(e.iop->argp, e.iop)) != '\0') {
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| 79 | if (c == -1) {
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| 80 | e.iop++;
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| 81 | continue;
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| 82 | }
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| 83 | if (e.iop == iostack)
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| 84 | ioecho(c);
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| 85 | return(e.iop->prev = c);
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| 86 | }
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| 87 | else if (e.iop->task == XIO && e.iop->prev != '\n') {
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| 88 | e.iop->prev = 0;
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| 89 | if (e.iop == iostack)
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| 90 | ioecho('\n');
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| 91 | return '\n';
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| 92 | }
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| 93 | }
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| 94 | if (e.iop->task == XIO) {
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| 95 | if (multiline)
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| 96 | return e.iop->prev = 0;
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| 97 | if (talking && e.iop == iostack+1)
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| 98 | prs(prompt->value);
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| 99 | }
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| 100 | }
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| 101 | if (e.iop >= iostack)
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| 102 | return(0);
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| 103 | leave();
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| 104 | /* NOTREACHED */
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| 105 | }
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| 106 |
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| 107 | void
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| 108 | ioecho(c)
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| 109 | char c;
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| 110 | {
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| 111 | if (flag['v'])
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| 112 | write(2, &c, sizeof c);
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| 113 | }
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| 114 |
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| 115 | void
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| 116 | pushio(argp, fn)
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| 117 | struct ioarg *argp;
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| 118 | int (*fn)();
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| 119 | {
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| 120 | if (++e.iop >= &iostack[NPUSH]) {
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| 121 | e.iop--;
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| 122 | err("Shell input nested too deeply");
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| 123 | gflg++;
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| 124 | return;
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| 125 | }
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| 126 | e.iop->iofn = fn;
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| 127 |
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| 128 | if (argp->afid != AFID_NOBUF)
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| 129 | e.iop->argp = argp;
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| 130 | else {
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| 131 | e.iop->argp = ioargstack + (e.iop - iostack);
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| 132 | *e.iop->argp = *argp;
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| 133 | e.iop->argp->afbuf = e.iop == &iostack[0] ? &mainbuf : &sharedbuf;
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| 134 | if (isatty(e.iop->argp->afile) == 0 &&
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| 135 | (e.iop == &iostack[0] ||
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| 136 | lseek(e.iop->argp->afile, 0L, 1) != -1)) {
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| 137 | if (++bufid == AFID_NOBUF)
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| 138 | bufid = AFID_ID;
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| 139 | e.iop->argp->afid = bufid;
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| 140 | }
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| 141 | }
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| 142 |
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| 143 | e.iop->prev = ~'\n';
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| 144 | e.iop->peekc = 0;
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| 145 | e.iop->xchar = 0;
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| 146 | e.iop->nlcount = 0;
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| 147 | if (fn == filechar || fn == linechar)
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| 148 | e.iop->task = XIO;
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| 149 | else if (fn == gravechar || fn == qgravechar)
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| 150 | e.iop->task = XGRAVE;
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| 151 | else
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| 152 | e.iop->task = XOTHER;
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| 153 | }
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| 154 |
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| 155 | struct io *
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| 156 | setbase(ip)
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| 157 | struct io *ip;
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| 158 | {
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| 159 | register struct io *xp;
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| 160 |
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| 161 | xp = e.iobase;
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| 162 | e.iobase = ip;
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| 163 | return(xp);
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| 164 | }
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| 165 |
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| 166 | /*
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| 167 | * Input generating functions
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| 168 | */
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| 169 |
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| 170 | /*
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| 171 | * Produce the characters of a string, then a newline, then EOF.
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| 172 | */
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| 173 | int
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| 174 | nlchar(ap)
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| 175 | register struct ioarg *ap;
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| 176 | {
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| 177 | register int c;
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| 178 |
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| 179 | if (ap->aword == NULL)
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| 180 | return(0);
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| 181 | if ((c = *ap->aword++) == 0) {
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| 182 | ap->aword = NULL;
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| 183 | return('\n');
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| 184 | }
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| 185 | return(c);
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| 186 | }
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| 187 |
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| 188 | /*
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| 189 | * Given a list of words, produce the characters
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| 190 | * in them, with a space after each word.
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| 191 | */
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| 192 | int
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| 193 | wdchar(ap)
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| 194 | register struct ioarg *ap;
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| 195 | {
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| 196 | register char c;
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| 197 | register char **wl;
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| 198 |
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| 199 | if ((wl = ap->awordlist) == NULL)
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| 200 | return(0);
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| 201 | if (*wl != NULL) {
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| 202 | if ((c = *(*wl)++) != 0)
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| 203 | return(c & 0177);
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| 204 | ap->awordlist++;
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| 205 | return(' ');
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| 206 | }
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| 207 | ap->awordlist = NULL;
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| 208 | return('\n');
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| 209 | }
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| 210 |
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| 211 | /*
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| 212 | * Return the characters of a list of words,
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| 213 | * producing a space between them.
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| 214 | */
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| 215 | int
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| 216 | dolchar(ap)
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| 217 | register struct ioarg *ap;
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| 218 | {
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| 219 | register char *wp;
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| 220 |
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| 221 | if ((wp = *ap->awordlist++) != NULL) {
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| 222 | PUSHIO(aword, wp, *ap->awordlist == NULL? strchar: xxchar);
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| 223 | return(-1);
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| 224 | }
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| 225 | return(0);
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| 226 | }
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| 227 |
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| 228 | static int
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| 229 | xxchar(ap)
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| 230 | register struct ioarg *ap;
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| 231 | {
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| 232 | register int c;
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| 233 |
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| 234 | if (ap->aword == NULL)
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| 235 | return(0);
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| 236 | if ((c = *ap->aword++) == '\0') {
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| 237 | ap->aword = NULL;
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| 238 | return(' ');
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| 239 | }
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| 240 | return(c);
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| 241 | }
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| 242 |
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| 243 | /*
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| 244 | * Produce the characters from a single word (string).
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| 245 | */
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| 246 | int
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| 247 | strchar(ap)
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| 248 | register struct ioarg *ap;
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| 249 | {
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| 250 | register int c;
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| 251 |
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| 252 | if (ap->aword == NULL || (c = *ap->aword++) == 0)
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| 253 | return(0);
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| 254 | return(c);
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| 255 | }
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| 256 |
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| 257 | /*
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| 258 | * Produce quoted characters from a single word (string).
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| 259 | */
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| 260 | int
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| 261 | qstrchar(ap)
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| 262 | register struct ioarg *ap;
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| 263 | {
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| 264 | register int c;
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| 265 |
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| 266 | if (ap->aword == NULL || (c = *ap->aword++) == 0)
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| 267 | return(0);
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| 268 | return(c|QUOTE);
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| 269 | }
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| 270 |
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| 271 | /*
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| 272 | * Return the characters from a file.
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| 273 | */
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| 274 | int
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| 275 | filechar(ap)
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| 276 | register struct ioarg *ap;
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| 277 | {
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| 278 | register int i;
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| 279 | char c;
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| 280 | struct iobuf *bp = ap->afbuf;
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| 281 |
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| 282 | if (ap->afid != AFID_NOBUF) {
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| 283 | if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) {
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| 284 | if (i)
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| 285 | lseek(ap->afile, ap->afpos, 0);
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| 286 | do {
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| 287 | i = read(ap->afile, bp->buf, sizeof(bp->buf));
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| 288 | } while (i < 0 && errno == EINTR);
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| 289 | if (i <= 0) {
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| 290 | closef(ap->afile);
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| 291 | return 0;
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| 292 | }
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| 293 | bp->id = ap->afid;
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| 294 | bp->ebufp = (bp->bufp = bp->buf) + i;
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| 295 | }
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| 296 | ap->afpos++;
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| 297 | return *bp->bufp++ & 0177;
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| 298 | }
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| 299 |
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| 300 | do {
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| 301 | i = read(ap->afile, &c, sizeof(c));
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| 302 | } while (i < 0 && errno == EINTR);
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| 303 | return(i == sizeof(c)? c&0177: (closef(ap->afile), 0));
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| 304 | }
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| 305 |
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| 306 | /*
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| 307 | * Return the characters from a here temp file.
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| 308 | */
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| 309 | int
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| 310 | herechar(ap)
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| 311 | register struct ioarg *ap;
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| 312 | {
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| 313 | char c;
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| 314 |
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| 315 |
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| 316 | if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
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| 317 | close(ap->afile);
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| 318 | c = 0;
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| 319 | }
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| 320 | return (c);
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| 321 |
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| 322 | }
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| 323 |
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| 324 | /*
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| 325 | * Return the characters produced by a process (`...`).
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| 326 | * Quote them if required, and remove any trailing newline characters.
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| 327 | */
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| 328 | int
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| 329 | gravechar(ap, iop)
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| 330 | struct ioarg *ap;
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| 331 | struct io *iop;
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| 332 | {
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| 333 | register int c;
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| 334 |
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| 335 | if ((c = qgravechar(ap, iop)&~QUOTE) == '\n')
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| 336 | c = ' ';
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| 337 | return(c);
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| 338 | }
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| 339 |
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| 340 | int
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| 341 | qgravechar(ap, iop)
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| 342 | register struct ioarg *ap;
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| 343 | struct io *iop;
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| 344 | {
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| 345 | register int c;
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| 346 |
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| 347 | if (iop->xchar) {
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| 348 | if (iop->nlcount) {
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| 349 | iop->nlcount--;
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| 350 | return('\n'|QUOTE);
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| 351 | }
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| 352 | c = iop->xchar;
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| 353 | iop->xchar = 0;
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| 354 | } else if ((c = filechar(ap)) == '\n') {
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| 355 | iop->nlcount = 1;
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| 356 | while ((c = filechar(ap)) == '\n')
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| 357 | iop->nlcount++;
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| 358 | iop->xchar = c;
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| 359 | if (c == 0)
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| 360 | return(c);
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| 361 | iop->nlcount--;
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| 362 | c = '\n';
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| 363 | }
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| 364 | return(c!=0? c|QUOTE: 0);
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| 365 | }
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| 366 |
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| 367 | /*
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| 368 | * Return a single command (usually the first line) from a file.
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| 369 | */
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| 370 | int
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| 371 | linechar(ap)
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| 372 | register struct ioarg *ap;
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| 373 | {
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| 374 | register int c;
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| 375 |
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| 376 | if ((c = filechar(ap)) == '\n') {
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| 377 | if (!multiline) {
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| 378 | closef(ap->afile);
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| 379 | ap->afile = -1; /* illegal value */
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| 380 | }
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| 381 | }
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| 382 | return(c);
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| 383 | }
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| 384 |
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| 385 | void
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| 386 | prs(s)
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| 387 | register char *s;
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| 388 | {
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| 389 | if (*s)
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| 390 | write(2, s, strlen(s));
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| 391 | }
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| 392 |
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| 393 | void
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| 394 | putc(c)
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| 395 | char c;
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| 396 | {
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| 397 | write(2, &c, sizeof c);
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| 398 | }
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| 399 |
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| 400 | void
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| 401 | prn(u)
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| 402 | unsigned u;
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| 403 | {
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| 404 | prs(itoa(u, 0));
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| 405 | }
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| 406 |
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| 407 | void
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| 408 | closef(i)
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| 409 | register int i;
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| 410 | {
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| 411 | if (i > 2)
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| 412 | close(i);
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| 413 | }
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| 414 |
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| 415 | void
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| 416 | closeall()
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| 417 | {
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| 418 | register u;
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| 419 |
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| 420 | for (u=NUFILE; u<NOFILE;)
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| 421 | close(u++);
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| 422 | }
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| 423 |
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| 424 | /*
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| 425 | * remap fd into Shell's fd space
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| 426 | */
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| 427 | int
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| 428 | remap(fd)
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| 429 | register int fd;
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| 430 | {
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| 431 | register int i;
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| 432 | int map[NOFILE];
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| 433 |
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| 434 | if (fd < e.iofd) {
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| 435 | for (i=0; i<NOFILE; i++)
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| 436 | map[i] = 0;
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| 437 | do {
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| 438 | map[fd] = 1;
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| 439 | fd = dup(fd);
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| 440 | } while (fd >= 0 && fd < e.iofd);
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| 441 | for (i=0; i<NOFILE; i++)
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| 442 | if (map[i])
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| 443 | close(i);
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| 444 | if (fd < 0)
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| 445 | err("too many files open in shell");
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| 446 | }
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| 447 | return(fd);
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| 448 | }
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| 449 |
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| 450 | int
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| 451 | openpipe(pv)
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| 452 | register int *pv;
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| 453 | {
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| 454 | register int i;
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| 455 |
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| 456 | if ((i = pipe(pv)) < 0)
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| 457 | err("can't create pipe - try again");
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| 458 | return(i);
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| 459 | }
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| 460 |
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| 461 | void
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| 462 | closepipe(pv)
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| 463 | register int *pv;
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| 464 | {
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| 465 | if (pv != NULL) {
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| 466 | close(*pv++);
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| 467 | close(*pv);
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| 468 | }
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| 469 | }
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| 470 |
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| 471 | /* -------- here.c -------- */
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| 472 | /* #include "sh.h" */
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| 473 |
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| 474 | /*
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| 475 | * here documents
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| 476 | */
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| 477 |
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| 478 | struct here {
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| 479 | char *h_tag;
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| 480 | int h_dosub;
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| 481 | struct ioword *h_iop;
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| 482 | struct here *h_next;
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| 483 | };
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| 484 |
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| 485 | static struct here *inhere; /* list of hear docs while parsing */
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| 486 | static struct here *acthere; /* list of active here documents */
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| 487 |
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| 488 | void
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| 489 | inithere()
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| 490 | {
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| 491 | inhere=acthere=(struct here*)0;
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| 492 | }
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| 493 |
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| 494 | void
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| 495 | markhere(s, iop)
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| 496 | register char *s;
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| 497 | struct ioword *iop;
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| 498 | {
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| 499 | register struct here *h, *lh;
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| 500 |
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| 501 | h = (struct here *) space(sizeof(struct here));
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| 502 | if (h == 0)
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| 503 | return;
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| 504 | h->h_tag = evalstr(s, DOSUB);
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| 505 | if (h->h_tag == 0)
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| 506 | return;
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| 507 | h->h_iop = iop;
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| 508 | iop->io_name = 0;
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| 509 | h->h_next = NULL;
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| 510 | if (inhere == 0)
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| 511 | inhere = h;
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| 512 | else
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| 513 | for (lh = inhere; lh!=NULL; lh = lh->h_next)
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| 514 | if (lh->h_next == 0) {
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| 515 | lh->h_next = h;
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| 516 | break;
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| 517 | }
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| 518 | iop->io_flag |= IOHERE|IOXHERE;
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| 519 | for (s = h->h_tag; *s; s++)
|
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| 520 | if (*s & QUOTE) {
|
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| 521 | iop->io_flag &= ~ IOXHERE;
|
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| 522 | *s &= ~ QUOTE;
|
|---|
| 523 | }
|
|---|
| 524 | h->h_dosub = iop->io_flag & IOXHERE;
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|---|
| 525 | }
|
|---|
| 526 |
|
|---|
| 527 | void
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| 528 | gethere()
|
|---|
| 529 | {
|
|---|
| 530 | register struct here *h, *hp;
|
|---|
| 531 |
|
|---|
| 532 | /* Scan here files first leaving inhere list in place */
|
|---|
| 533 | for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
|
|---|
| 534 | readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub? 0: '\'');
|
|---|
| 535 |
|
|---|
| 536 | /* Make inhere list active - keep list intact for scraphere */
|
|---|
| 537 | if (hp != NULL) {
|
|---|
| 538 | hp->h_next = acthere;
|
|---|
| 539 | acthere = inhere;
|
|---|
| 540 | inhere = NULL;
|
|---|
| 541 | }
|
|---|
| 542 | }
|
|---|
| 543 |
|
|---|
| 544 | static void
|
|---|
| 545 | readhere(name, s, ec)
|
|---|
| 546 | char **name;
|
|---|
| 547 | register char *s;
|
|---|
| 548 | int ec;
|
|---|
| 549 | {
|
|---|
| 550 | int tf;
|
|---|
| 551 | char tname[30];
|
|---|
| 552 | register c;
|
|---|
| 553 | jmp_buf ev;
|
|---|
| 554 | char line [LINELIM+1];
|
|---|
| 555 | char *next;
|
|---|
| 556 |
|
|---|
| 557 | tempname(tname);
|
|---|
| 558 | *name = strsave(tname, areanum);
|
|---|
| 559 | tf = creat(tname, 0600);
|
|---|
| 560 | if (tf < 0)
|
|---|
| 561 | return;
|
|---|
| 562 | if (newenv(setjmp(errpt = ev)) != 0)
|
|---|
| 563 | unlink(tname);
|
|---|
| 564 | else {
|
|---|
| 565 | pushio(e.iop->argp, e.iop->iofn);
|
|---|
| 566 | e.iobase = e.iop;
|
|---|
| 567 | for (;;) {
|
|---|
| 568 | if (talking && e.iop <= iostack)
|
|---|
| 569 | prs(cprompt->value);
|
|---|
| 570 | next = line;
|
|---|
| 571 | while ((c = readc()) != '\n' && c) {
|
|---|
| 572 | if (next >= &line[LINELIM]) {
|
|---|
| 573 | c = 0;
|
|---|
| 574 | break;
|
|---|
| 575 | }
|
|---|
| 576 | *next++ = c;
|
|---|
| 577 | }
|
|---|
| 578 | *next = 0;
|
|---|
| 579 | if (strcmp(s, line) == 0 || c == 0)
|
|---|
| 580 | break;
|
|---|
| 581 | *next++ = '\n';
|
|---|
| 582 | write (tf, line, (int)(next-line));
|
|---|
| 583 | }
|
|---|
| 584 | if (c == 0) {
|
|---|
| 585 | prs("here document `"); prs(s); err("' unclosed");
|
|---|
| 586 | }
|
|---|
| 587 | quitenv();
|
|---|
| 588 | }
|
|---|
| 589 | close(tf);
|
|---|
| 590 | }
|
|---|
| 591 |
|
|---|
| 592 | /*
|
|---|
| 593 | * open here temp file.
|
|---|
| 594 | * if unquoted here, expand here temp file into second temp file.
|
|---|
| 595 | */
|
|---|
| 596 | int
|
|---|
| 597 | herein(hname, xdoll)
|
|---|
| 598 | char *hname;
|
|---|
| 599 | int xdoll;
|
|---|
| 600 | {
|
|---|
| 601 | register hf, tf;
|
|---|
| 602 |
|
|---|
| 603 | if (hname == 0)
|
|---|
| 604 | return(-1);
|
|---|
| 605 | hf = open(hname, 0);
|
|---|
| 606 | if (hf < 0)
|
|---|
| 607 | return (-1);
|
|---|
| 608 | if (xdoll) {
|
|---|
| 609 | char c;
|
|---|
| 610 | char tname[30];
|
|---|
| 611 | jmp_buf ev;
|
|---|
| 612 |
|
|---|
| 613 | tempname(tname);
|
|---|
| 614 | if ((tf = creat(tname, 0600)) < 0)
|
|---|
| 615 | return (-1);
|
|---|
| 616 | if (newenv(setjmp(errpt = ev)) == 0) {
|
|---|
| 617 | PUSHIO(afile, hf, herechar);
|
|---|
| 618 | setbase(e.iop);
|
|---|
| 619 | while ((c = subgetc(0, 0)) != 0) {
|
|---|
| 620 | char c1 = c&~QUOTE;
|
|---|
| 621 |
|
|---|
| 622 | if (c"E && !any(c1,"`$\\"))
|
|---|
| 623 | write(tf,"\\",1);
|
|---|
| 624 | write(tf, &c1, 1);
|
|---|
| 625 | }
|
|---|
| 626 | quitenv();
|
|---|
| 627 | } else
|
|---|
| 628 | unlink(tname);
|
|---|
| 629 | close(tf);
|
|---|
| 630 | tf = open(tname, 0);
|
|---|
| 631 | unlink(tname);
|
|---|
| 632 | return (tf);
|
|---|
| 633 | } else
|
|---|
| 634 | return (hf);
|
|---|
| 635 | }
|
|---|
| 636 |
|
|---|
| 637 | void
|
|---|
| 638 | scraphere()
|
|---|
| 639 | {
|
|---|
| 640 | register struct here *h;
|
|---|
| 641 |
|
|---|
| 642 | for (h = inhere; h != NULL; h = h->h_next) {
|
|---|
| 643 | if (h->h_iop && h->h_iop->io_name)
|
|---|
| 644 | unlink(h->h_iop->io_name);
|
|---|
| 645 | }
|
|---|
| 646 | inhere = NULL;
|
|---|
| 647 | }
|
|---|
| 648 |
|
|---|
| 649 | /* unlink here temp files before a freearea(area) */
|
|---|
| 650 | void
|
|---|
| 651 | freehere(area)
|
|---|
| 652 | int area;
|
|---|
| 653 | {
|
|---|
| 654 | register struct here *h, *hl;
|
|---|
| 655 |
|
|---|
| 656 | hl = NULL;
|
|---|
| 657 | for (h = acthere; h != NULL; h = h->h_next)
|
|---|
| 658 | if (getarea((char *) h) >= area) {
|
|---|
| 659 | if (h->h_iop->io_name != NULL)
|
|---|
| 660 | unlink(h->h_iop->io_name);
|
|---|
| 661 | if (hl == NULL)
|
|---|
| 662 | acthere = h->h_next;
|
|---|
| 663 | else
|
|---|
| 664 | hl->h_next = h->h_next;
|
|---|
| 665 | } else
|
|---|
| 666 | hl = h;
|
|---|
| 667 | }
|
|---|
| 668 |
|
|---|
| 669 | void
|
|---|
| 670 | tempname(tname)
|
|---|
| 671 | char *tname;
|
|---|
| 672 | {
|
|---|
| 673 | static int inc;
|
|---|
| 674 | register char *cp, *lp;
|
|---|
| 675 |
|
|---|
| 676 | for (cp = tname, lp = "/tmp/shtm"; (*cp = *lp++) != '\0'; cp++)
|
|---|
| 677 | ;
|
|---|
| 678 | lp = putn(getpid()*1000 + inc++);
|
|---|
| 679 | for (; (*cp = *lp++) != '\0'; cp++)
|
|---|
| 680 | ;
|
|---|
| 681 | }
|
|---|
