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#include "stralloc.h"
#include <stdlib.h>
#include "alloc.h"
#include "byte.h"
#include "str.h"
/**
@file stralloc.c
@author djb
@source qmail, ucspi-tcp
@brief genious dynamic string handling
*/
int stralloc_starts(stralloc *sa, const char *s)
{
int len;
len = str_len(s);
return (sa->len >= len) && byte_equal(s, len, sa->s);
}
int stralloc_cat(stralloc *sato, stralloc *safrom)
{
return stralloc_catb(sato, safrom->s, safrom->len);
}
int stralloc_catb(stralloc *sa, const char *s, unsigned int n)
{
if (!sa->s) return stralloc_copyb(sa, s, n);
if (!stralloc_readyplus(sa, n + 1)) return 0;
byte_copy(sa->s + sa->len, n, s);
sa->len += n;
sa->s[sa->len] = 'Z'; /* ``offensive programming'' */
return 1;
}
int stralloc_cats(stralloc *sa, const char *s)
{
return stralloc_catb(sa, s, str_len(s));
}
int stralloc_copy(stralloc *sato, stralloc *safrom)
{
return stralloc_copyb(sato, safrom->s, safrom->len);
}
int stralloc_ready(stralloc *sa, size_t len)
{
register size_t wanted = len + (len >> 3) + 30; /* heuristic from djb */
if (wanted < len) wanted = len;
if (!sa->s || sa->a < len) {
register char *tmp;
if (!(tmp = realloc(sa->s, wanted))) // !!! needs stdlib (realloc)
return 0;
sa->a = wanted;
sa->s = tmp;
}
return 1;
}
int stralloc_readyplus(stralloc *sa, size_t len)
{
if (sa->s) {
if (sa->len + len < len) return 0; /* catch integer overflow */
return stralloc_ready(sa, sa->len + len);
} else
return stralloc_ready(sa, len);
}
int stralloc_copyb(stralloc *sa, const char *s, unsigned int n)
{
if (!stralloc_ready(sa, n + 1)) return 0;
byte_copy(sa->s, n, s);
sa->len = n;
sa->s[n] = 'Z'; /* ``offensive programming'' */
return 1;
}
int stralloc_copys(stralloc *sa, const char *s)
{
return stralloc_copyb(sa, s, str_len(s));
}
int stralloc_catulong0(stralloc *sa, unsigned long u, unsigned int n)
{
unsigned int len;
unsigned long q;
char *s;
len = 1;
q = u;
while (q > 9) {
++len;
q /= 10;
}
if (len < n) len = n;
if (!stralloc_readyplus(sa, len)) return 0;
s = sa->s + sa->len;
sa->len += len;
while (len) {
s[--len] = '0' + (u % 10);
u /= 10;
}
return 1;
}
int stralloc_catlong0(stralloc *sa, long l, unsigned int n)
{
if (l < 0) {
if (!stralloc_append(sa, "-")) return 0;
l = -l;
}
return stralloc_catulong0(sa, l, n);
}
int stralloc_append(stralloc *sa, const char *in)
{
if (stralloc_readyplus(sa, 1)) {
sa->s[sa->len] = *in;
++sa->len;
return 1;
}
return 0;
}
void stralloc_free(stralloc *sa)
{
if (sa->s) free(sa->s);
sa->s = 0;
sa->a = sa->len = 0;
}
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