198 lines
3.3 KiB
C
198 lines
3.3 KiB
C
#include "wordexp.h"
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <errno.h>
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#include <fcntl.h>
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//##include <bthread.h>
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#include <sys/types.h>
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extern int pipe2(int *, int);
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static void reap(pid_t pid)
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{
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int status;
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for (;;) {
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if (waitpid(pid, &status, 0) < 0) {
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if (errno != EINTR) return;
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} else {
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if (WIFEXITED(status)) return;
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}
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}
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}
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static char *getword(FILE *f)
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{
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char *s = 0;
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return getdelim(&s, (size_t [1]){0}, 0, f) < 0 ? 0 : s;
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}
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static int do_wordexp(const char *s, wordexp_t *we, int flags)
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{
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size_t i, l;
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int sq=0, dq=0;
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size_t np=0;
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char *w, **tmp;
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char *redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null";
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int err = 0;
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FILE *f;
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size_t wc = 0;
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char **wv = 0;
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int p[2];
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pid_t pid;
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sigset_t set;
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sigset_t all_set;
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if (flags & WRDE_REUSE) wordfree(we);
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if (flags & WRDE_NOCMD) for (i=0; s[i]; i++) switch (s[i]) {
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case '\\':
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if (!sq) i++;
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break;
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case '\'':
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if (!dq) sq^=1;
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break;
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case '"':
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if (!sq) dq^=1;
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break;
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case '(':
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if (np) {
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np++;
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break;
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}
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case ')':
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if (np) {
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np--;
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break;
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}
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case '\n':
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case '|':
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case '&':
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case ';':
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case '<':
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case '>':
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case '{':
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case '}':
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if (!(sq|dq|np)) return WRDE_BADCHAR;
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break;
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case '$':
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if (sq) break;
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if (s[i+1]=='(' && s[i+2]=='(') {
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i += 2;
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np += 2;
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break;
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} else if (s[i+1] != '(') break;
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case '`':
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if (sq) break;
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return WRDE_CMDSUB;
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}
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if (flags & WRDE_APPEND) {
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wc = we->we_wordc;
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wv = we->we_wordv;
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}
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i = wc;
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if (flags & WRDE_DOOFFS) {
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if (we->we_offs > SIZE_MAX/sizeof(void *)/4)
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goto nospace;
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i += we->we_offs;
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} else {
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we->we_offs = 0;
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}
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if (pipe2(p, O_CLOEXEC) < 0) goto nospace;
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// sigfillset(&all_set);
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// sigprocmask(SIG_SETMASK, &all_set, &set);
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pid = fork();
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// sigprocmask(SIG_SETMASK, &set, &all_set);
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if (pid < 0) {
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close(p[0]);
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close(p[1]);
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goto nospace;
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}
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if (!pid) {
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if (p[1] == 1) fcntl(1, F_SETFD, 0);
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else dup2(p[1], 1);
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execl("/data/data/com.termux/files/usr/bin/sh", "sh", "-c",
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"eval \"printf %s\\\\\\\\0 x $1 $2\"",
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"sh", s, redir, (char *)0);
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_exit(1);
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}
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close(p[1]);
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f = fdopen(p[0], "r");
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if (!f) {
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close(p[0]);
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kill(pid, SIGKILL);
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reap(pid);
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goto nospace;
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}
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l = wv ? i+1 : 0;
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free(getword(f));
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if (feof(f)) {
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fclose(f);
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reap(pid);
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return WRDE_SYNTAX;
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}
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while ((w = getword(f))) {
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if (i+1 >= l) {
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l += l/2+10;
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tmp = realloc(wv, l*sizeof(char *));
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if (!tmp) break;
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wv = tmp;
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}
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wv[i++] = w;
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wv[i] = 0;
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}
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if (!feof(f)) err = WRDE_NOSPACE;
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fclose(f);
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reap(pid);
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if (!wv) wv = calloc(i+1, sizeof *wv);
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we->we_wordv = wv;
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we->we_wordc = i;
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if (flags & WRDE_DOOFFS) {
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if (wv) for (i=we->we_offs; i; i--)
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we->we_wordv[i-1] = 0;
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we->we_wordc -= we->we_offs;
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}
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return err;
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nospace:
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if (!(flags & WRDE_APPEND)) {
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we->we_wordc = 0;
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we->we_wordv = 0;
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}
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return WRDE_NOSPACE;
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}
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int wordexp(const char *restrict s, wordexp_t *restrict we, int flags)
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{
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int r, cs;
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//pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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r = do_wordexp(s, we, flags);
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//pthread_setcancelstate(cs, 0);
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return r;
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}
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void wordfree(wordexp_t *we)
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{
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size_t i;
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if (!we->we_wordv) return;
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for (i=0; i<we->we_wordc; i++) free(we->we_wordv[we->we_offs+i]);
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free(we->we_wordv);
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we->we_wordv = 0;
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we->we_wordc = 0;
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}
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