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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "strbuf.h"
static void die(const char *format, ...)
{
va_list arg;
va_start(arg, format);
vfprintf(stderr, format, arg);
va_end(arg);
exit(-1);
}
void strbuf_init(strbuf_t *s)
{
s->data = NULL;
s->size = 0;
s->length = 0;
s->increment = STRBUF_DEFAULT_INCREMENT;
}
strbuf_t *strbuf_new()
{
strbuf_t *s;
s = malloc(sizeof(strbuf_t));
if (!s)
die("Out of memory");
strbuf_init(s);
return s;
}
void strbuf_set_increment(strbuf_t *s, int increment)
{
if (increment <= 0)
die("BUG: Invalid string increment");
s->increment = increment;
}
void strbuf_free(strbuf_t *s)
{
if (s->data)
free(s->data);
free(s);
}
char *strbuf_to_char(strbuf_t *s, int *len)
{
char *data;
data = s->data;
if (len)
*len = s->length;
free(s);
return data;
}
/* Ensure strbuf can handle a string length bytes long (ignoring NULL
* optional termination). */
void strbuf_resize(strbuf_t *s, int len)
{
int newsize;
/* Esnure there is room for optional NULL termination */
newsize = len + 1;
/* Round up to the next increment */
newsize = ((newsize + s->increment - 1) / s->increment) * s->increment;
s->size = newsize;
s->data = realloc(s->data, s->size);
if (!s->data)
die("Out of memory");
}
void strbuf_append_mem(strbuf_t *s, const char *c, int len)
{
if (len > strbuf_emptylen(s))
strbuf_resize(s, s->length + len);
memcpy(s->data + s->length, c, len);
s->length += len;
}
void strbuf_ensure_null(strbuf_t *s)
{
s->data[s->length] = 0;
}
void strbuf_append_fmt(strbuf_t *s, const char *fmt, ...)
{
va_list arg;
int fmt_len, try;
int empty_len;
/* If the first attempt to append fails, resize the buffer appropriately
* and try again */
for (try = 0; ; try++) {
va_start(arg, fmt);
/* Append the new formatted string */
/* fmt_len is the length of the string required, excluding the
* trailing NULL */
empty_len = strbuf_emptylen(s);
/* Add 1 since there is also space for the terminating NULL.
* If the string hasn't been allocated then empty_len == -1,
* and vsprintf() won't store anything on the first pass */
fmt_len = vsnprintf(s->data + s->length, empty_len + 1, fmt, arg);
va_end(arg);
if (fmt_len <= empty_len)
break; /* SUCCESS */
if (try > 0)
die("BUG: length of formatted string changed");
strbuf_resize(s, s->length + fmt_len);
}
s->length += fmt_len;
}
/* vi:ai et sw=4 ts=4:
*/
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