Code:
#include <stdio.h>
#include <stdlib.h>
/* String Length */
int str_len(char *string)
{
char *count = string;
while(*count) {count++;}
return count - string;
}
/* String Append */
char* str_append(char* string, char* append) {
char* newstring = NULL;
size_t needed = snprintf(NULL, 0, "%s%s", string, append);
newstring = malloc(needed);
sprintf(newstring, "%s%s", string, append);
return newstring;
}
/* String Append Char */
char* str_append_chr(char* string, char append) {
char* newstring = NULL;
size_t needed = snprintf(NULL, 0, "%s%c", string, append);
newstring = malloc(needed);
sprintf(newstring, "%s%c", string, append);
return newstring;
}
/* String Equals */
int str_equals(char *equal1, char *eqaul2)
{
while(*equal1==*eqaul2)
{
if ( *equal1 == '\0' || *eqaul2 == '\0' ){break;}
equal1++;
eqaul2++;
}
if(*eqaul1 == '\0' && *eqaul2 == '\0' ){return 0;}
else {return -1};
}
/* String Replace */
char* str_replace(char* search, char* replace, char* subject) {
char* newstring = "";
int i = 0;
for(i = 0; i < str_len(subject); i++) {
if (subject[i] == search[0]) {
int e = 0;
char* calc = "";
for(e = 0; e < str_len(search); e++) {
if(subject[i+e] == search[e]) {
calc = str_append_chr(calc, search[e]);
}
}
if (str_equals(search, calc) == 0) {
newstring = str_append(newstring, replace);
i = i + str_len (search)-1;
}
else {
newstring = str_append_chr(newstring, subject[i]);
}
}
else {
newstring = str_append_chr(newstring, subject[i]);
}
}
return newstring;
}
/* String Replace Maximal */
char* str_replace_max(char* search, char* replace, char* subject, int count) {
char* newstring = "";
int i = 0;
for(i = 0; i < str_len(subject); i++) {
if (subject[i] == search[0]) {
int e = 0;
char* calc = "";
for(e = 0; e < str_len(search); e++) {
if(subject[i+e] == search[e]) {
calc = str_append_chr(calc, search[e]);
}
}
if (str_equals(search, calc) == 0) {
if(count > 0) {
newstring = str_append(newstring, replace);
i = i + str_len (search)-1;
count = count - 1;
}
else {
newstring = str_append_chr(newstring, subject[i]);
}
}
else {
newstring = str_append_chr(newstring, subject[i]);
}
}
else {
newstring = str_append_chr(newstring, subject[i]);
}
}
return newstring;
}