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/* brkstring.c -- (destructively) split a string into
* -- an array of substrings
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include "h/mh.h"
#include "brkstring.h"
#include "utils.h"
/* allocate this number of pointers at a time */
#define NUMBROKEN 256
static char **broken = NULL; /* array of substring start addresses */
static int len = 0; /* current size of "broken" */
/*
* static prototypes
*/
static int brkany (char, char *);
char **
brkstring (char *str, char *brksep, char *brkterm)
{
int i;
char c, *s;
/* allocate initial space for pointers on first call */
if (!broken) {
len = NUMBROKEN;
broken = mh_xmalloc ((size_t) (len * sizeof(*broken)));
}
/*
* scan string, replacing separators with zeroes
* and enter start addresses in "broken".
*/
s = str;
for (i = 0;; i++) {
/* enlarge pointer array, if necessary */
if (i >= len) {
len += NUMBROKEN;
broken = mh_xrealloc (broken, (size_t) (len * sizeof(*broken)));
}
while (brkany (c = *s, brksep))
*s++ = '\0';
/*
* we are either at the end of the string, or the
* terminator found has been found, so finish up.
*/
if (!c || brkany (c, brkterm)) {
*s = '\0';
broken[i] = NULL;
break;
}
/* set next start addr */
broken[i] = s;
while ((c = *++s) && !brkany (c, brksep) && !brkany (c, brkterm))
; /* empty body */
}
return broken;
}
/*
* If the character is in the string,
* return 1, else return 0.
*/
static int
brkany (char c, char *str)
{
return str && c && strchr(str, c);
}
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