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/* ----------------------------------------------------------------------- *
*
* cat_path.c - boundary aware buffer management routines
*
* Copyright 2002-2003 Ian Kent <raven@themaw.net> - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
* USA; either version 2 of the License, or (at your option) any later
* version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include <string.h>
#include <limits.h>
#include <ctype.h>
#include "automount.h"
/*
* sum = "dir/base" with attention to buffer overflows, and multiple
* slashes at the joint are avoided.
*/
int cat_path(char *buf, size_t len, const char *dir, const char *base)
{
char *d = (char *) dir;
char *b = (char *) base;
char *s = buf;
size_t left = len;
if ((*s = *d))
while ((*++s = *++d) && --left) ;
if (!left) {
*s = '\0';
return 0;
}
/* Now we have at least 1 left in output buffer */
while (*--s == '/' && (left++ < len))
*s = '\0';
*++s = '/';
left--;
if (*b == '/')
while (*++b == '/');
while (--left && (*++s = *b++)) ;
if (!left) {
*s = '\0';
return 0;
}
return 1;
}
size_t _strlen(const char *str, size_t max)
{
const char *s = str;
size_t len = 0;
while (*s++ && len < max)
len++;
return len;
}
/*
* sum = "dir/base" with attention to buffer overflows, and multiple
* slashes at the joint are avoided. The length of base is specified
* explicitly.
*/
int ncat_path(char *buf, size_t len,
const char *dir, const char *base, size_t blen)
{
char name[PATH_MAX+1];
size_t alen = _strlen(base, blen);
if (blen > PATH_MAX || !alen)
return 0;
strncpy(name, base, alen);
name[alen] = '\0';
return cat_path(buf, len, dir, name);
}
/* Compare first n bytes of s1 and s2 and that n == strlen(s1) */
int _strncmp(const char *s1, const char *s2, size_t n)
{
size_t len = strlen(s1);
if (n && n != len)
return n - len;
return strncmp(s1, s2, n);
}
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