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/* Private version of the libc *mntent() routines. */
/* Note slightly different prototypes. */
/* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*/
#include <stdio.h>
#include <string.h> /* for index */
#include <ctype.h> /* for isdigit */
#include "mntent.h"
#include "sundries.h" /* for xmalloc */
#include "nls.h"
/* Unfortunately the classical Unix /etc/mtab and /etc/fstab
do not handle directory names containing spaces.
Here we mangle them, replacing a space by \040.
What do other Unices do? */
static unsigned char need_escaping[] = { ' ', '\t', '\n', '\\' };
static char *
mangle(unsigned char *s) {
char *ss, *sp;
int n;
n = strlen(s);
ss = sp = xmalloc(4*n+1);
while(1) {
for (n = 0; n < sizeof(need_escaping); n++) {
if (*s == need_escaping[n]) {
*sp++ = '\\';
*sp++ = '0' + ((*s & 0300) >> 6);
*sp++ = '0' + ((*s & 070) >> 3);
*sp++ = '0' + (*s & 07);
goto next;
}
}
*sp++ = *s;
if (*s == 0)
break;
next:
s++;
}
return ss;
}
static int
is_space_or_tab (char c) {
return (c == ' ' || c == '\t');
}
static char *
skip_spaces(char *s) {
while (is_space_or_tab(*s))
s++;
return s;
}
static char *
skip_nonspaces(char *s) {
while (*s && !is_space_or_tab(*s))
s++;
return s;
}
#define isoctal(a) (((a) & ~7) == '0')
/* returns malloced pointer - no more strdup required */
static char *
unmangle(char *s) {
char *ret, *ss, *sp;
ss = skip_nonspaces(s);
ret = sp = xmalloc(ss-s+1);
while(s != ss) {
if (*s == '\\' && isoctal(s[1]) && isoctal(s[2]) && isoctal(s[3])) {
*sp++ = 64*(s[1] & 7) + 8*(s[2] & 7) + (s[3] & 7);
s += 4;
} else
*sp++ = *s++;
}
*sp = 0;
return ret;
}
/*
* fstat'ing the file and allocating a buffer holding all of it
* may be a bad idea: if the file is /proc/mounts, the stat
* returns 0.
* (On the other hand, mangling and unmangling is meaningless
* for /proc/mounts.)
*/
mntFILE *
my_setmntent (const char *file, char *mode) {
mntFILE *mfp = xmalloc(sizeof(*mfp));
mfp->mntent_fp = fopen (file, mode);
mfp->mntent_file = xstrdup(file);
mfp->mntent_errs = (mfp->mntent_fp == NULL);
mfp->mntent_softerrs = 0;
mfp->mntent_lineno = 0;
return mfp;
}
void
my_endmntent (mntFILE *mfp) {
if (mfp) {
if (mfp->mntent_fp)
fclose(mfp->mntent_fp);
if (mfp->mntent_file)
free(mfp->mntent_file);
free(mfp);
}
}
int
my_addmntent (mntFILE *mfp, struct mntent *mnt) {
char *m1, *m2, *m3, *m4;
int res;
if (fseek (mfp->mntent_fp, 0, SEEK_END))
return 1; /* failure */
m1 = mangle(mnt->mnt_fsname);
m2 = mangle(mnt->mnt_dir);
m3 = mangle(mnt->mnt_type);
m4 = mangle(mnt->mnt_opts);
res = ((fprintf (mfp->mntent_fp, "%s %s %s %s %d %d\n",
m1, m2, m3, m4, mnt->mnt_freq, mnt->mnt_passno)
< 0) ? 1 : 0);
free(m1);
free(m2);
free(m3);
free(m4);
return res;
}
/* Read the next entry from the file fp. Stop reading at an incorrect entry. */
struct mntent *
my_getmntent (mntFILE *mfp) {
static char buf[4096];
static struct mntent me;
char *s;
again:
if (mfp->mntent_errs || mfp->mntent_softerrs >= ERR_MAX)
return NULL;
/* read the next non-blank non-comment line */
do {
if (fgets (buf, sizeof(buf), mfp->mntent_fp) == NULL)
return NULL;
mfp->mntent_lineno++;
s = index (buf, '\n');
if (s == NULL) {
/* Missing final newline? Otherwise extremely */
/* long line - assume file was corrupted */
if (feof(mfp->mntent_fp)) {
fprintf(stderr, _("[mntent]: warning: no final "
"newline at the end of %s\n"),
mfp->mntent_file);
s = index (buf, 0);
} else {
mfp->mntent_errs = 1;
goto err;
}
}
*s = 0;
if (--s >= buf && *s == '\r')
*s = 0;
s = skip_spaces(buf);
} while (*s == '\0' || *s == '#');
me.mnt_fsname = unmangle(s);
s = skip_nonspaces(s);
s = skip_spaces(s);
me.mnt_dir = unmangle(s);
s = skip_nonspaces(s);
s = skip_spaces(s);
me.mnt_type = unmangle(s);
s = skip_nonspaces(s);
s = skip_spaces(s);
me.mnt_opts = unmangle(s);
s = skip_nonspaces(s);
s = skip_spaces(s);
if(isdigit(*s)) {
me.mnt_freq = atoi(s);
while(isdigit(*s)) s++;
} else
me.mnt_freq = 0;
if(*s && !is_space_or_tab(*s))
goto err;
s = skip_spaces(s);
if(isdigit(*s)) {
me.mnt_passno = atoi(s);
while(isdigit(*s)) s++;
} else
me.mnt_passno = 0;
if(*s && !is_space_or_tab(*s))
goto err;
/* allow more stuff, e.g. comments, on this line */
return &me;
err:
mfp->mntent_softerrs++;
fprintf(stderr, _("[mntent]: line %d in %s is bad%s\n"),
mfp->mntent_lineno, mfp->mntent_file,
(mfp->mntent_errs || mfp->mntent_softerrs >= ERR_MAX) ?
_("; rest of file ignored") : "");
goto again;
}
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