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#include "env.h"
#include "../malloc/malloc.h"
#include "../cstr/cstr.h"
char **envp;
u64 envsize = 0;
#define ENVSIZEINC 16
char **__getenvpair(const char *key);
u8 __match_env_key(const char *p, const char *key);
const char *getenv(const char *key)
{
char **p = __getenvpair(key);
const char *value;
if (p == 0)
return "";
value = *p;
while (*value != '=') ++value;
return ++value;
}
void setenv(const char *key, const char *value)
{
char **p = __getenvpair(key);
if (p == 0) {
p = envp;
while (*p) ++p;
if (p - envp >= envsize) {
if (envsize == 0) {
for (; *(envp + envsize); ++envsize);
char **nenvp = malloc(sizeof(char *) * (envsize + ENVSIZEINC));
p = nenvp;
while (p < nenvp + envsize + ENVSIZEINC) *(p++) = 0;
p = nenvp;
while (*envp) *(p++) = *(envp++);
envp = nenvp;
} else {
envp = realloc(envp, envsize + ENVSIZEINC);
}
p = envp + envsize;
envsize += ENVSIZEINC;
}
}
*p = malloc((cstr_length(key) + cstr_length(value)) + 2);
char *i = *p;
while (*key) *(i++) = *(key++);
*(i++) = '=';
while (*value) *(i++) = *(value++);
*i = 0;
}
char **__getenvpair(const char *key)
{
char **p = envp;
while (*p) {
if (__match_env_key(*p, key)) {
return p;
}
++p;
}
return 0;
}
const char **getenvp()
{
return (const char**)envp;
}
u8 __match_env_key(const char *p, const char *key)
{
while (*key && *p) {
if (*key != *p)
return 0;
++p;
++key;
}
if (*p != '=')
return 0;
return 1;
}
void init_env(int argc, const char **argv, char **envp__)
{
envp = envp__;
}
#ifdef ENV_UNIT_TEST
#include "../io/io.h"
int main(int argc, const char **argv)
{
wstdf("TEST: %s\n", getenv("TEST"));
setenv("TEST", "Hello, World!");
wstdf("TEST: %s\n", getenv("TEST"));
}
#endif
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