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/* str/case_start.c - Case insensitive string prefix matching
* Copyright (C) 2003,2005 Bruce Guenter <bruce@untroubled.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <string.h>
#include "str.h"
/** Match the prefix of the string to a binary chunk. */
int str_case_startb(const str* a, const char* b, unsigned len)
{
const char* aptr;
if (len > a->len) return 0;
for (aptr = a->s; len > 0; --len) {
char bc = *b++;
char ac = *aptr++;
if (isupper(bc)) bc = tolower(bc);
if (isupper(ac)) ac = tolower(ac);
if (ac != bc) return 0;
}
return 1;
}
/** Match the prefix of the string to a C string. */
int str_case_starts(const str* a, const char* b)
{
return str_case_startb(a, b, strlen(b));
}
/** Match the prefix of the string to another string. */
int str_case_start(const str* a, const str* b)
{
return str_case_startb(a, b->s, b->len);
}
#ifdef SELFTEST_MAIN
static str s = { "Return-Path: <>\n", 16, 0 };
void t(const char* f)
{
obuf_putu(&outbuf, str_case_starts(&s, f));
obuf_endl(&outbuf);
}
MAIN
{
t("Return-");
t("return-");
t("XYZZY");
t("Return-Path: <>\n");
t("Return-Path: <>\n ");
t("return-path: <>\n");
t("return-path: <>\n ");
}
#endif
#ifdef SELFTEST_EXP
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0
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0
#endif
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