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how to find the exact pattern from a file?
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/* 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 condi-
tions
are met:
1. Redistributions of source code must retain the above copy-
right
notice, this list of conditions and the following dis-
claimer.
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 pro-
vided
with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EX-
PRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IM-
PLIED
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 CONSE-
QUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTI-
TUTE
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(3pub) C Programmer's Manual STRGSUB(3pub)
*/
NAME
strgsub - substitute all occurences of pattern with another string
SYNOPSIS
#include <publib.h>
int strgsub(char *str, const char *pat, const char *sub, size_t max);
DESCRIPTION
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 terminat-
ing ' ') 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.
RETURN VALUE
strgsub returns the number of substitutions made, or -1 if the result would not have fit into max chars.
EXAMPLE
To substitute every "foo" with "bar" in a line, one might do the following.
strgsub(line, "foo", "bar", strlen(line)+1);
SEE ALSO
publib(3), strstr(3), strsub(3)
AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)
Publib C Programmer's Manual STRGSUB(3pub)