59 lines
1.4 KiB
C
Executable File
59 lines
1.4 KiB
C
Executable File
#include <string.h>
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#include <stdbool.h>
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#include <stdio.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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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) printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
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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) 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) printf("Looking for a match.\n");
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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) 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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}
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else {
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if(DEBUG) 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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