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66 lines
1.8 KiB
66 lines
1.8 KiB
#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#define DEBUG false
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/*
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See also:
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* <https://web.archive.org/web/20160201212501/coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring>
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* https://github.com/irl/la-cucina/blob/master/str_replace.c
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*/
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int str_replace_start(const char* string, const char* target, const char* replacement, char* output)
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{
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int l1 = strlen(string);
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int l2 = strlen(target);
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int l3 = strlen(replacement);
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int l4 = strlen(output);
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if (DEBUG)
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printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
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// if(DEBUG) printf("%s,%s,%s,%s\n", string, target, replacement, output);
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if ((l4 < (l1 - l2 + l3)) || l4 < l1) {
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// Not enough memory in output string.
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if (DEBUG)
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printf("String not long enough.\n");
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return 1;
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}
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/* else if(l1 < l2){
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// Not even possible that there is a match.
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if(DEBUG) printf("Target larger than string.\n");
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strcpy(output, string);
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} */
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else {
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if (DEBUG)
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printf("Looking for a match for %s in %s.\n", target, string);
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int match = true;
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for (int i = 0; i < l2; i++) {
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if (string[i] != target[i]) {
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match = false;
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break;
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}
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}
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if (match) {
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if (DEBUG)
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printf("Found match.\n");
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for (int i = 0; i < l3; i++) {
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output[i] = replacement[i];
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}
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int counter = l3;
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for (int i = l2; i < l1; i++) {
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output[counter] = string[i];
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counter++;
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}
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output[counter] = '\0';
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return 2; // success
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} else {
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if (DEBUG)
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printf("Did not find match.\n");
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strcpy(output, string);
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}
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}
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return 0;
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}
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