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/*
* libdpkg - Debian packaging suite library routines
* string.c - string handling routines
*
* Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
* Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
*
* This 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; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <string.h>
#include <dpkg/c-ctype.h>
#include <dpkg/string.h>
#include <dpkg/dpkg.h>
/**
* Match the end of a string.
*
* @param str The string.
* @param end The end to match in str.
*
* @return Whether the string was matched at the end.
*/
bool
str_match_end(const char *str, const char *end)
{
size_t str_len = strlen(str);
size_t end_len = strlen(end);
const char *str_end = str + str_len - end_len;
if (str_len >= end_len && strcmp(str_end, end) == 0)
return true;
else
return false;
}
/**
* Escape format characters from a string.
*
* @param dst The destination string.
* @param src The source string.
* @param n The size of the destination buffer.
*
* @return The end of the destination string.
*/
char *
str_escape_fmt(char *dst, const char *src, size_t n)
{
char *d = dst;
const char *s = src;
if (n == 0)
return d;
while (*s) {
if (*s == '%') {
if (n-- <= 2)
break;
*d++ = '%';
}
if (n-- <= 1)
break;
*d++ = *s++;
}
*d = '\0';
return d;
}
/**
* Quote shell metacharacters in a string.
*
* This function allows passing strings to commands without splitting the
* arguments, like in system(3)
*
* @param src The source string to escape.
*
* @return The new allocated string (never NULL).
*/
char *
str_quote_meta(const char *src)
{
char *new_dst, *dst;
new_dst = dst = m_malloc(strlen(src) * 2);
while (*src) {
if (!c_isdigit(*src) && !c_isalpha(*src))
*dst++ = '\\';
*dst++ = *src++;
}
*dst = '\0';
return new_dst;
}
/**
* Check and strip possible surrounding quotes in string.
*
* @param str The string to act on.
*
* @return A pointer to str or NULL if the quotes were unbalanced.
*/
char *
str_strip_quotes(char *str)
{
if (str[0] == '"' || str[0] == '\'') {
size_t str_len = strlen(str);
if (str[0] != str[str_len - 1])
return NULL;
/* Remove surrounding quotes. */
str[str_len - 1] = '\0';
str++;
}
return str;
}
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