petidomo/libtext/find_string.c
2000-12-13 13:19:03 +00:00

62 lines
1.2 KiB
C

/*
* $Source$
* $Revision$
* $Date$
*
* Copyright (C) 1996 by CyberSolutions GmbH.
* All rights reserved.
*/
#include <string.h>
#include "text.h"
/* A simple text search.
This function performs a simple, case-independent text search in
the indicated buffer.
RETURNS: FindString() returns a pointer to the first occurance of
"string" in "buffer", or NULL, if the string was not found.
NOTE: This routine will perform poorly on larger text buffers.
AUTHOR: Peter Simons <simons@rhein.de>
*/
char *
text_find_string(char * buffer, /* text buffer */
char * string /* string to find */
)
{
int buffer_len;
int string_len;
char * result;
/* Sanity checks. */
assert(buffer != NULL);
assert(string != NULL);
if (!buffer || !string)
return NULL;
buffer_len = strlen(buffer);
string_len = strlen(string);
if (buffer_len == 0 || buffer_len < string_len)
return NULL;
if (string_len == 0)
return buffer;
/* Now look for the string. */
for(result = NULL; buffer_len >= string_len; buffer++, buffer_len--) {
if (!strncasecmp(buffer, string, string_len)) {
result = buffer;
break;
}
}
return result;
}