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_strtok.c
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_strtok.c
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#include "shell.h"
int token_length(char *str, char *delim);
int count_tok(char *str, char *delim);
char **_strtok(char *input, char *delim);
/**
* token_length - This function calculates the length of first token.
*
* @str: The string to search in.
* @delim: The delimiter to be used.
*
* Return: The delimiter index showing the end of
* the intitial token pointed to the string
*/
int token_length(char *str, char *delim)
{
int i = 0;
int len = 0;
while (*(str + i) && *(str + i) != *delim)
{
len++;
i++;
}
return (len);
}
/**
* count_tok - Counts the number of words with delimiter(tokens)
* in the string.
*
* @str: The string to search in.
* @delim: The delimiter to be used.
*
* Return: The number of tokens inside the string provided.
*/
int count_tok(char *str, char *delim)
{
int i;
int tkens = 0;
int len = 0;
for (i = 0; *(str + i); i++)
len++;
for (i = 0; i < len ; i++)
{
if (*(str + i) != *delim)
{
tkens++;
i += token_length(str + i, delim);
}
}
return (tkens);
}
/**
* _strtok - This function tokenizes a string.
*
* @input: The string to tokenize.
* @delim: The delimiter to use.
*
* Return: A pointer to an array of the tokens.
*/
char **_strtok(char *input, char *delim)
{
char **p;
int i = 0, tkens, x, letters, y;
tkens = count_tok(input, delim);
if (tkens == 0)
return (NULL);
p = malloc(sizeof(char *) * (tkens + 2));
if (!p)
return (NULL);
for (x = 0; x < tkens; x++)
{
while (input[i] == *delim)
i++;
letters = token_length(input + i, delim);
p[x] = malloc(sizeof(char) * (letters + 1));
if (!p[x])
{
for (i -= 1; i >= 0; i--)
free(p[i]);
free(p);
return (NULL);
}
for (y = 0; y < letters; y++)
{
p[x][y] = input[i];
i++;
}
p[x][y] = '\0';
}
p[x] = NULL;
p[x + 1] = NULL;
return (p);
}