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#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#define DEBUG false
// String manipulation
void str_init(char* str, int n)
{
// could also use <https://manpages.ubuntu.com/manpages/impish/man3/strinit.3pub.html>
for (int i = 0; i < n; i++)
str[i] = ' ';
str[n] = '\0';
}
int str_replace_start(const char* string, const char* target, const char* replacement, char* output)
{
int l1 = strlen(string);
int l2 = strlen(target);
int l3 = strlen(replacement);
int l4 = strlen(output);
if (DEBUG) {
printf("string: %s, target: %s, replacement: %s, output: %s\n", string, target, replacement, output);
printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
}
if ((l4 < (l1 - l2 + l3)) || l4 < l1) {
printf("Not enough memory in output string.\n");
return 1;
}
int match = true;
for (int i = 0; i < l2; i++) {
if (string[i] != target[i]) {
match = false;
break;
}
}
if (match) {
if (DEBUG) printf("Found match.\n");
for (int i = 0; i < l3; i++) {
output[i] = replacement[i];
}
int counter = l3;
for (int i = l2; i < l1; i++) {
output[counter] = string[i];
counter++;
}
output[counter] = '\0';
return 2; // success
} else {
if (DEBUG) printf("Did not find match.\n");
strcpy(output, string);
}
return 0;
}
/*
See also:
* <https://web.archive.org/web/20160201212501/coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring>
* https://github.com/irl/la-cucina/blob/master/str_replace.c
*/
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