Replacing one string with other in C

Question

I have a string

{&quot;status&quot;:true}

I want to replace &quot with ". I tried several string operations, but they're not working.

Could you show the *several string operations* you have tried so that we can see what might be wrong with them? — Darin Dimitrov, Sep 17 '11 at 21:49
http://stackoverflow.com/questions/779875/what-is-the-function-to-replace-string-in-c — Mark Byers, Sep 17 '11 at 21:51
with strings the only recommendation would be strstr in C++, but I think it's the same for C, too, I'm not sure. — apollosoftware.org, Sep 17 '11 at 22:04
@Darin: there is no string operation which tells about "replace" — user537670, Sep 17 '11 at 22:15
@user537670, does this answer my comment about what you have tried so far? — Darin Dimitrov, Sep 17 '11 at 22:17

score 1 · Answer 1 · answered Oct 08 '11 at 08:58

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *replace (char *this, char *withthat, char *inthis) {
    char *where = inthis;
    if(strlen(withthat)>strlen(this)) {
        fprintf(stderr, "replace can only shrink\n");
        exit(EXIT_FAILURE);
    }
    while ((where = strstr(where, this))) {
        memcpy(where, withthat, strlen(withthat));
        memmove(where+strlen(withthat),where+strlen(this), strlen(where+strlen(this))+1);
    }
    return inthis;
}

int main(void) {
    char string[] = "{&quot;status&quot;:true}";
    printf("%s\n", replace("&quot;", "\"", string));
    return 0;
}

Output:

{"status":true}

Replacing one string with other in C

1 Answers1