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/*
--------------------------------------------------------------------
Module: REPLACE.C
Author: Gilles Kohl
Started: 09.06.1992 12:16:47
Modified: 09.06.1992 12:41:41
Subject: Replace one string by another in a given buffer.
This code is public domain. Use freely.
--------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* StrReplace: Replace OldStr by NewStr in string Str.
*
* Str should have enough allocated space for the replacement, no check
* is made for this. Str and OldStr/NewStr should not overlap.
* The empty string ("") is found at the beginning of every string.
*
* Returns: pointer to first location behind where NewStr was inserted
* or NULL if OldStr was not found.
* This is useful for multiple replacements, see example in main() below
* (be careful not to replace the empty string this way !)
*/
char *StrReplace(char *Str, char *OldStr, char *NewStr)
{
int OldLen, NewLen;
char *p, *q;
if(NULL == (p = strstr(Str, OldStr)))
return p;
OldLen = strlen(OldStr);
NewLen = strlen(NewStr);
memmove(q = p+NewLen, p+OldLen, strlen(p+OldLen)+1);
memcpy(p, NewStr, NewLen);
return q;
}
#ifdef TEST
/*
* Test main().
* Given two arguments, replaces the first arg. in the lines read from
* stdin by the second one.
* Example invocation:
* replace printf puts <replace.c
* will replace all printf's by puts in replace's source.
*
*/
int main(int argc, char *argv[])
{
char buf[200];
char *Start;
if(argc != 3)
exit(1);
/* Repeat until all occurences replaced */
while(NULL != (Start = gets(buf)))
{
while(NULL != (Start = StrReplace(Start, argv[1], argv[2])))
;
printf("%s\n", buf);
}
return 0;
}
#endif TEST
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