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/* ISC license. */
#include <errno.h>
#include <skalibs/bytestr.h>
#include <skalibs/stralloc.h>
int string_format (stralloc *sa, char const *vars, char const *format, char const *const *args)
{
static unsigned char const tab[2][4] = { "1442", "4833" } ;
char class[256] = "3222222222222222222222222222222222222022222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222" ;
unsigned int varlen = str_len(vars) ;
unsigned int base = sa->len ;
int wasnull = !sa->s ;
unsigned int state = 0 ;
for (; state < varlen ; state++)
if (class[(unsigned char)vars[state]] == '2')
class[(unsigned char)vars[state]] = '1' ;
else return (errno = EINVAL, 0) ;
for (state = 0 ; state < 2 ; format++)
{
unsigned char c = tab[state][class[(unsigned char)(*format)] - '0'] ;
state = c & 3 ;
if (c & 4) if (!stralloc_catb(sa, format, 1)) goto err ;
if (c & 8) if (!stralloc_cats(sa, args[byte_chr(vars, varlen, *format)])) goto err ;
}
if (state == 2) return 1 ;
errno = EINVAL ;
err:
if (wasnull) stralloc_free(sa) ; else sa->len = base ;
return 0 ;
}
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