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string_split.c
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string_split.c
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#include "shell_head.h"
/*
* string_split() takes a string and places all the
* words into an array of strings.
*/
char **string_split(char *s, char seperator)
{
int i, i2, i3;
char **ss;
char *t;
i = count_words(s, seperator);
ss = malloc(sizeof(char *) * (i + 1));
if (ss == NULL) {
return NULL;
}
i2 = 0;
i3 = 0;
while(i2 < i) {
if (s[i3] != seperator && s[i3] != '\0') {
ss[i2] = malloc(sizeof(char) * (count_chars(&(s[i3]), seperator) + 1));
if (ss[i2] == NULL) {
return NULL;
}
t = ss[i2];
while(s[i3] != seperator && s[i3] != '\0') {
*t++ = s[i3];
i3++;
}
*t = '\0';
while(s[i3] == seperator && s[i3] != '\0') {
i3++;
}
i2++;
}
else {
i3++;
}
}
ss[i] = NULL;
return ss;
}
/* count_chars() counts how many chars are in a string */
int count_chars(char *s1, char seperator)
{
int i;
i = 0;
while(*s1 != seperator && *s1 != '\0') {
s1++;
i++;
}
return i;
}
/*
* count_words() counts how many words are in a string.
* A word must contain
* alphanumerical symbols only.
*/
int count_words(char *s, char seperator)
{
int i;
i = 0;
while(*s != '\0') {
if (*s != seperator) {
i++;
}
while(*s != seperator && *s != '\0') {
s++;
}
while(*s == seperator && *s != '\0') {
s++;
}
}
return i;
}