99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
#include <notmine.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <debug.h>
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//https://stackoverflow.com/a/779960/8229149
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char *str_replace(char *orig, char *rep, char *with) {
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char *result; // the return string
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char *ins; // the next insert point
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char *tmp; // varies
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int len_rep; // length of rep (the string to remove)
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int len_with; // length of with (the string to replace rep with)
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int len_front; // distance between rep and end of last rep
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int count; // number of replacements
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// sanity checks and initialization
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if (!orig || !rep)
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return NULL;
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len_rep = strlen(rep);
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if (len_rep == 0)
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return NULL; // empty rep causes infinite loop during count
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if (!with)
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with = "";
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len_with = strlen(with);
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// count the number of replacements needed
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ins = orig;
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for (count = 0; (tmp = strstr(ins, rep)); ++count) {
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ins = tmp + len_rep;
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}
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tmp = result = malloc(strlen(orig) + (len_with - len_rep) * count + 1);
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if (!result)
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return NULL;
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// first time through the loop, all the variable are set correctly
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// from here on,
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// tmp points to the end of the result string
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// ins points to the next occurrence of rep in orig
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// orig points to the remainder of orig after "end of rep"
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while (count--) {
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ins = strstr(orig, rep);
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len_front = ins - orig;
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tmp = strncpy(tmp, orig, len_front) + len_front;
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tmp = strcpy(tmp, with) + len_with;
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orig += len_front + len_rep; // move to next "end of rep"
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}
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strcpy(tmp, orig);
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return result;
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}
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/* char *str_index_replace(char *orig, int rep_s, int rep_e, char *with) {
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// Ugh, Re-worked the preceding str_replace function to work with indexes
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char *result; // the return string
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char *ins; // the next insert point
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char *tmp; // varies
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int len_rep; // length of rep (the string to remove)
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int len_with; // length of with (the string to replace rep with)
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int len_front; // distance between rep and end of last rep
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// sanity checks and initialization
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if (!orig || !rep_e){
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DEBUG_ERROR("[orig or rep_e is false] *orig=%p; rep_s=%d, rep_e=%d\n", 67, orig, rep_s, rep_e);
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return NULL;
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}
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len_rep = rep_e - rep_s;
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if (len_rep == 0){
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DEBUG_ERROR("[rep empty]\n", 72);
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return NULL; // empty rep causes infinite loop during count
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}
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if (!with)
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with = "";
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len_with = strlen(with);
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tmp = result = malloc(strlen(orig) + (len_with - len_rep) + 1);
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if (!result) {
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DEBUG_ERROR("[bad malloc]", 83);
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return NULL;
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}
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// first time through the loop, all the variable are set correctly
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// from here on,
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// tmp points to the end of the result string
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// ins points to the next occurrence of rep in orig
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// orig points to the remainder of orig after "end of rep"
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ins = orig + rep_s;
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len_front = ins - orig;
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tmp = strncpy(tmp, orig, len_front) + len_front;
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tmp = strcpy(tmp, with) + len_with;
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orig += len_front + len_rep; // move to next "end of rep"
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strcpy(tmp, orig);
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return result;
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} */ |