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STRGSUB(3) C Programmer's Manual STRGSUB(3)
/* Part of publib.

Copyright (c) 1994-2006 Lars Wirzenius. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

strgsub - substitute all occurences of pattern with another string

#include <publib.h>
int strgsub(char *str, const char *pat, const char *sub, size_t max);

strgsub finds all occurences of the pattern pat in the string str (using a method similar to strstr(3) to find the occurrences, i.e., no regular expressions), and replaces each with sub. If pat does not occur in str, no substitution is made. The size (including the terminating '\0') of the string after the substitutions may be at most max chars. If it would be larger, no substitutions are made.

Of course, if sub is an empty string, the occurences of the pattern are deleted from the string.

strgsub returns the number of substitutions made, or -1 if the result would not have fit into max chars.

To substitute every "foo" with "bar" in a line, one might do the following.


strgsub(line, "foo", "bar", strlen(line)+1);

publib(3), strstr(3), strsub(3)

Lars Wirzenius (lars.wirzenius@helsinki.fi)
C Programmer's Manual Publib

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