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127 lines
2.5 KiB
127 lines
2.5 KiB
#include <stdio.h>
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#include <string.h>
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#include <mntent.h>
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#include <errno.h>
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#include <limits.h>
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static char *internal_buf;
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static size_t internal_bufsize;
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#define SENTINEL (char *)&internal_buf
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FILE *setmntent(const char *name, const char *mode)
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{
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return fopen(name, mode);
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}
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int endmntent(FILE *f)
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{
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if (f) fclose(f);
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return 1;
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}
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static char *unescape_ent(char *beg)
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{
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char *dest = beg;
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const char *src = beg;
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while (*src) {
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const char *val;
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unsigned char cval = 0;
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if (*src != '\\') {
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*dest++ = *src++;
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continue;
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}
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if (src[1] == '\\') {
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++src;
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*dest++ = *src++;
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continue;
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}
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val = src + 1;
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for (int i = 0; i < 3; ++i) {
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if (*val >= '0' && *val <= '7') {
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cval <<= 3;
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cval += *val++ - '0';
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} else {
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break;
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}
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}
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if (cval) {
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*dest++ = cval;
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src = val;
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} else {
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*dest++ = *src++;
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}
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}
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*dest = 0;
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return beg;
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}
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struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
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{
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int n[8], use_internal = (linebuf == SENTINEL);
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size_t len, i;
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mnt->mnt_freq = 0;
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mnt->mnt_passno = 0;
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do {
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if (use_internal) {
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getline(&internal_buf, &internal_bufsize, f);
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linebuf = internal_buf;
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} else {
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fgets(linebuf, buflen, f);
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}
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if (feof(f) || ferror(f)) return 0;
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if (!strchr(linebuf, '\n')) {
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fscanf(f, "%*[^\n]%*[\n]");
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errno = ERANGE;
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return 0;
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}
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len = strlen(linebuf);
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if (len > INT_MAX) continue;
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for (i = 0; i < sizeof n / sizeof *n; i++) n[i] = len;
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sscanf(linebuf, " %n%*[^ \t\n]%n %n%*[^ \t\n]%n %n%*[^ \t\n]%n %n%*[^ \t\n]%n %d %d",
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n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
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&mnt->mnt_freq, &mnt->mnt_passno);
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} while (linebuf[n[0]] == '#' || n[1]==len);
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linebuf[n[1]] = 0;
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linebuf[n[3]] = 0;
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linebuf[n[5]] = 0;
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linebuf[n[7]] = 0;
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mnt->mnt_fsname = unescape_ent(linebuf+n[0]);
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mnt->mnt_dir = unescape_ent(linebuf+n[2]);
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mnt->mnt_type = unescape_ent(linebuf+n[4]);
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mnt->mnt_opts = unescape_ent(linebuf+n[6]);
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return mnt;
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}
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struct mntent *getmntent(FILE *f)
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{
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static struct mntent mnt;
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return getmntent_r(f, &mnt, SENTINEL, 0);
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}
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int addmntent(FILE *f, const struct mntent *mnt)
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{
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if (fseek(f, 0, SEEK_END)) return 1;
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return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
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mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
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mnt->mnt_freq, mnt->mnt_passno) < 0;
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}
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char *hasmntopt(const struct mntent *mnt, const char *opt)
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{
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size_t l = strlen(opt);
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char *p = mnt->mnt_opts;
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for (;;) {
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if (!strncmp(p, opt, l) && (!p[l] || p[l]==',' || p[l]=='='))
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return p;
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p = strchr(p, ',');
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if (!p) return 0;
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p++;
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}
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}
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