kaguya
98 lines
1.9 KiB
C++
98 lines
1.9 KiB
C++
#include <errno.h>
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#include <mntent.h>
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#include <stdio.h>
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#include <limits.h>
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#include <string.h>
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#include <bits/ensure.h>
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namespace {
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char *internal_buf;
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size_t internal_bufsize;
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}
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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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return fopen(name, mode);
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}
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struct mntent *getmntent(FILE *f) {
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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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if(fseek(f, 0, SEEK_END)) {
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return 1;
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}
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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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int endmntent(FILE *f) {
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if(f) {
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fclose(f);
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}
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return 1;
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}
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char *hasmntopt(const struct mntent *mnt, const char *opt) {
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return strstr(mnt->mnt_opts, opt);
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}
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/* Adapted from musl */
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struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen) {
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int n[8];
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bool use_internal = (linebuf == SENTINEL);
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int len;
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size_t 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)) {
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return 0;
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}
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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) {
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continue;
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}
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for(i = 0; i < sizeof n / sizeof *n; i++) {
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n[i] = len;
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}
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sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%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 = linebuf + n[0];
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mnt->mnt_dir = linebuf + n[2];
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mnt->mnt_type = linebuf + n[4];
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mnt->mnt_opts = linebuf + n[6];
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return mnt;
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}
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