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/* Public domain. */
#include "stralloc.h"
#include "alloc.h"
#include "str.h"
#include "byte.h"
#include "env.h"
#include "pathexec.h"
static stralloc plus;
static stralloc tmp;
int pathexec_env(const char *s,const char *t)
{
if (!s) return 1;
if (!stralloc_copys(&tmp,s)) return 0;
if (t) {
if (!stralloc_cats(&tmp,"=")) return 0;
if (!stralloc_cats(&tmp,t)) return 0;
}
if (!stralloc_0(&tmp)) return 0;
return stralloc_cat(&plus,&tmp);
}
void pathexec_env_run(const char *file, const char *const *argv)
{
const char **e;
unsigned int elen;
unsigned int i;
unsigned int j;
unsigned int split;
unsigned int t;
if (!stralloc_cats(&plus,"")) return;
elen = 0;
for (i = 0;environ[i];++i)
++elen;
for (i = 0;i < plus.len;++i)
if (!plus.s[i])
++elen;
e = (const char **) alloc((elen + 1) * sizeof(char *));
if (!e) return;
elen = 0;
for (i = 0;environ[i];++i)
e[elen++] = environ[i];
j = 0;
for (i = 0;i < plus.len;++i)
if (!plus.s[i]) {
split = str_chr(plus.s + j,'=');
for (t = 0;t < elen;++t)
if (byte_equal(plus.s + j,split,e[t]))
if (e[t][split] == '=') {
--elen;
e[t] = e[elen];
break;
}
if (plus.s[j + split])
e[elen++] = plus.s + j;
j = i + 1;
}
e[elen] = 0;
pathexec_run(file,argv,e);
alloc_free(e);
}
void pathexec(const char *const *argv)
{
return pathexec_env_run(*argv, argv);
}
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