rtpg_strreplace()

char* rtpg_strreplace	(	const char *	str,
		const char *	oldstr,
		const char *	newstr,
		int *	count
	)

Definition at line 55 of file rtpg_internal.c.

Referenced by RASTER_colorMap(), RASTER_mapAlgebra2(), RASTER_mapAlgebraExpr(), RASTER_nMapAlgebraExpr(), and rtpg_removespaces().

  {
        const char *tmp = str;
        char *result;
        int found = 0;
        int length, reslen;
        int oldlen = strlen(oldstr);
        int newlen = strlen(newstr);
        int limit = (count != NULL && *count > 0) ? *count : -1;

        tmp = str;
        while ((tmp = strstr(tmp, oldstr)) != NULL && found != limit)
                found++, tmp += oldlen;

        length = strlen(str) + found * (newlen - oldlen);
        if ((result = (char *) palloc(length + 1)) == NULL) {
                fprintf(stderr, "Not enough memory\n");
                found = -1;
        }
        else {
                tmp = str;
                limit = found; /* Countdown */
                reslen = 0; /* length of current result */

                /* Replace each old string found with new string  */
                while ((limit-- > 0) && (tmp = strstr(tmp, oldstr)) != NULL) {
                        length = (tmp - str); /* Number of chars to keep intouched */
                        strncpy(result + reslen, str, length); /* Original part keeped */
                        strcpy(result + (reslen += length), newstr); /* Insert new string */

                        reslen += newlen;
                        tmp += oldlen;
                        str = tmp;
                }
                strcpy(result + reslen, str); /* Copies last part and ending null char */
        }

        if (count != NULL) *count = found;
        return result;
}

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