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#define _BSD_SOURCE
#include <nl_types.h>
#include <string.h>
#include <stdint.h>
#include <endian.h>
#include <errno.h>
#include <langinfo.h>
#include <locale.h>
#include <sys/mman.h>
#include "libc.h"
#define V(p) be32toh(*(uint32_t *)(p))
static nl_catd do_catopen(const char *name)
{
size_t size;
const unsigned char *map = __map_file(name, &size);
/* Size recorded in the file must match file size; otherwise
* the information needed to unmap the file will be lost. */
if (!map || V(map) != 0xff88ff89 || 20+V(map+8) != size) {
if(map) munmap((void *)map, size);
errno = ENOENT;
return (nl_catd)-1;
}
return (nl_catd)map;
}
nl_catd catopen(const char *name, int oflag)
{
nl_catd catd;
if (strchr(name, '/')) return do_catopen(name);
char buf[PATH_MAX];
size_t i;
const char *path, *lang, *p, *z;
if (libc.secure || !(path = getenv("NLSPATH"))) {
errno = ENOENT;
return (nl_catd)-1;
}
lang = oflag ? nl_langinfo(_NL_LOCALE_NAME(LC_MESSAGES)) : getenv("LANG");
if (!lang) lang = "";
for (p=path; *p; p=z) {
i = 0;
z = __strchrnul(p, ':');
for (; p<z; p++) {
const char *v;
size_t l;
if (*p!='%') v=p, l=1;
else switch (*++p) {
case 'N': v=name; l=strlen(v); break;
case 'L': v=lang; l=strlen(v); break;
case 'l': v=lang; l=strcspn(v,"_.@"); break;
case 't':
v=__strchrnul(lang,'_');
if (*v) v++;
l=strcspn(v,".@");
break;
case 'c': v="UTF-8"; l=5; break;
case '%': v="%"; l=1; break;
default: v=0;
}
if (!v || l >= sizeof buf - i) {
break;
}
memcpy(buf+i, v, l);
i += l;
}
if (!*z && (p<z || !i)) break;
if (p<z) continue;
if (*z) z++;
buf[i] = 0;
/* Leading : or :: in NLSPATH is same as %N */
catd = do_catopen(i ? buf : name);
if (catd != (nl_catd)-1) return catd;
}
errno = ENOENT;
return (nl_catd)-1;
}
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