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#include <string.h>
#include "../include/string.h"
#include "../include/strexp.h"
#ifdef MEMWATCH
# include "memwatch.h"
#endif
char **strexp(const char *str, int *n);
char **strchrexp(const char *str, char c, int *n);
/*
* Returns a dynamically allocated array of strings exploded from
* the delimiting periods of white space characters in the given
* string str. Value of n will be updated to the number of strings
* returned.
*
* Calling function must deallocate the returned strings and the
* array.
*
* Example:
*
* "ball rock hood"
*
* Will be exploded into:
*
* "ball" "rock" "hood"
*/
char **strexp(const char *str, int *n)
{
char **ret;
const char *head, *tail;
int num;
int len;
/* return NULL if given an empty string */
if(!str)
return(NULL);
num = 0;
head = tail = str;
ret = NULL;
/* iterate while we're inside the string */
while(*head)
{
/* skip to next non-blank character */
while(ISBLANK(*head))
head++;
/* find next blank character */
tail = head;
while(*tail && !ISBLANK(*tail))
tail++;
/* determine length of substring */
len = (tail - head);
/* add string to list */
num++;
ret = (char **)realloc(ret, num * sizeof(char *));
ret[num - 1] = (char *)malloc(len + 1);
/* copy string over and null-terminate */
strncpy(ret[num - 1], head, len);
ret[num - 1][len] = '\0';
/* get ready for next substring */
head = tail;
}
/* we're done... */
(*n) = num;
return ret;
}
/*
* Returns a dynamically allocated array of strings exploded from
* each delimiating character c in the given string str. Value of
* n will be updated to the number of strings returned.
*
* Calling function must deallocate the returned strings and the
* array.
*
* Example (if c == ':'):
*
* "ball:rock :hood::cat"
*
* Will be exploded into:
*
* "ball" "rock " "hood" "" "cat"
*/
char **strchrexp(const char *str, char c, int *n)
{
char **ret;
const char *head, *tail;
int num;
int len;
/* return NULL if given an empty string */
if(!str)
return(NULL);
num = 0;
head = tail = str;
ret = NULL;
/* Iterate while we're inside the string */
while((*head) && (*tail))
{
/* Seek tail from head to next occurance of c or end. */
tail = head;
while((*tail) && ((*tail) != c))
tail++;
/* Calculate length of substring. */
len = (tail - head);
/* Add string to list. */
num++;
ret = (char **)realloc(ret, num * sizeof(char *));
ret[num - 1] = (char *)malloc((len + 1) * sizeof(char));
/* copy string over and null-terminate */
strncpy(ret[num - 1], head, len);
ret[num - 1][len] = '\0';
/* Seek head past tail or to end of string. */
head = tail + ((*tail) ? 1 : 0);
}
/* we're done... */
(*n) = num;
return ret;
}
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