diff options
author | Rich Felker <dalias@aerifal.cx> | 2011-04-15 12:06:34 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-04-15 12:06:34 -0400 |
commit | d251c2645c86e89704545337b955ff8b3e835290 (patch) | |
tree | 4b4931a8923699c719392458c413a3748f5794ce /src/misc | |
parent | 69cf09c821b94668f03c942585d99c13121731c8 (diff) | |
download | musl-d251c2645c86e89704545337b955ff8b3e835290.tar.gz |
implement wordexp. first try, may be buggy. intended to be safe.
Diffstat (limited to 'src/misc')
-rw-r--r-- | src/misc/wordexp.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/misc/wordexp.c b/src/misc/wordexp.c new file mode 100644 index 00000000..b0d6846f --- /dev/null +++ b/src/misc/wordexp.c @@ -0,0 +1,128 @@ +#include <wordexp.h> +#include <unistd.h> +#include <stdio.h> +#include <string.h> +#include <limits.h> +#include <stdint.h> +#include <stdlib.h> + +static char *getword(FILE *f) +{ + char *s = 0; + return getdelim(&s, (size_t [1]){0}, 0, f) < 0 ? 0 : s; +} + +int wordexp(const char *s, wordexp_t *we, int flags) +{ + size_t i, l, len; + int sq=0, dq=0; + size_t np=0; + char *cmd, *w, **tmp; + char *redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null"; + int err = 0, status; + FILE *f; + size_t wc = 0; + char **wv = 0; + + if (flags & WRDE_REUSE) wordfree(we); + + if (flags & WRDE_NOCMD) for (i=0; s[i]; i++) switch (s[i]) { + case '\\': + if (!sq) i++; + break; + case '\'': + if (!dq) sq^=1; + break; + case '"': + if (!sq) dq^=1; + break; + case '(': + if (np) { + np++; + break; + } + case ')': + if (np) { + np--; + break; + } + case '\n': + case '|': + case '&': + case ';': + case '<': + case '>': + case '{': + case '}': + if (!(sq|dq|np)) return WRDE_BADCHAR; + break; + case '$': + if (s[i+1]=='(' && s[i+2]=='(') { + i += 2; + np += 2; + break; + } else if (s[i+1] != '(') break; + case '`': + if (sq) break; + return WRDE_CMDSUB; + } + + if (flags & WRDE_APPEND) { + wc = we->we_wordc; + wv = we->we_wordv; + } + + i = wc; + if (flags & WRDE_DOOFFS) { + if (we->we_offs > SIZE_MAX/sizeof(void *)/4) + return WRDE_NOSPACE; + i += we->we_offs; + } + + len = 50 + strlen(s); + cmd = malloc(len); + if (!cmd) return WRDE_NOSPACE; + snprintf(cmd, len, "printf %%s\\\\0 %s %s", s, redir); +printf("{%s}\n", cmd); + f = popen(cmd, "r"); + free(cmd); + if (!f) return WRDE_NOSPACE; + + l = wv ? i+1 : 0; + + while ((w = getword(f))) { + if (i+1 >= l) { + l += l/2+10; + tmp = realloc(wv, l*sizeof(char *)); + if (!tmp) break; + wv = tmp; + } + wv[i++] = w; + wv[i] = 0; + } + if (!feof(f)) err = WRDE_NOSPACE; + + status = pclose(f); + if (WEXITSTATUS(status)) { + if (!(flags & WRDE_APPEND)) { + free(wv); + return WRDE_SYNTAX; + } else if (wv==we->we_wordv) { + return WRDE_SYNTAX; + } + } + + we->we_wordv = wv; + we->we_wordc = i - we->we_offs; + return err; +} + +void wordfree(wordexp_t *we) +{ + size_t i; + if (!we->we_wordv) return; + for (i=0; i<we->we_wordc; i++) free(we->we_wordv[we->we_offs+i]); + free(we->we_wordv); + we->we_wordv = 0; + we->we_wordc = 0; +} |