1#define _BSD_SOURCE
 2#include <nl_types.h>
 3#include <string.h>
 4#include <stdint.h>
 5#include <endian.h>
 6#include <errno.h>
 7#include <langinfo.h>
 8#include <locale.h>
 9#include <sys/mman.h>
10#include "libc.h"
11
12#define V(p) be32toh(*(uint32_t *)(p))
13
14static nl_catd do_catopen(const char *name)
15{
16	size_t size;
17	const unsigned char *map = __map_file(name, &size);
18	/* Size recorded in the file must match file size; otherwise
19	 * the information needed to unmap the file will be lost. */
20	if (!map || V(map) != 0xff88ff89 || 20+V(map+8) != size) {
21		if(map) munmap((void *)map, size);
22		errno = ENOENT;
23		return (nl_catd)-1;
24	}
25	return (nl_catd)map;
26}
27
28nl_catd catopen(const char *name, int oflag)
29{
30	nl_catd catd;
31
32	if (strchr(name, '/')) return do_catopen(name);
33
34	char buf[PATH_MAX];
35	size_t i;
36	const char *path, *lang, *p, *z;
37	if (libc.secure || !(path = getenv("NLSPATH"))) {
38		errno = ENOENT;
39		return (nl_catd)-1;
40	}
41	lang = oflag ? nl_langinfo(_NL_LOCALE_NAME(LC_MESSAGES)) : getenv("LANG");
42	if (!lang) lang = "";
43	for (p=path; *p; p=z) {
44		i = 0;
45		z = __strchrnul(p, ':');
46		for (; p<z; p++) {
47			const char *v;
48			size_t l;
49			if (*p!='%') v=p, l=1;
50			else switch (*++p) {
51			case 'N': v=name; l=strlen(v); break;
52			case 'L': v=lang; l=strlen(v); break;
53			case 'l': v=lang; l=strcspn(v,"_.@"); break;
54			case 't':
55				v=__strchrnul(lang,'_');
56				if (*v) v++;
57				l=strcspn(v,".@");
58				break;
59			case 'c': v="UTF-8"; l=5; break;
60			case '%': v="%"; l=1; break;
61			default: v=0;
62			}
63			if (!v || l >= sizeof buf - i) {
64				break;
65			}
66			memcpy(buf+i, v, l);
67			i += l;
68		}
69		if (!*z && (p<z || !i)) break;
70		if (p<z) continue;
71		if (*z) z++;
72		buf[i] = 0;
73		/* Leading : or :: in NLSPATH is same as %N */
74		catd = do_catopen(i ? buf : name);
75		if (catd != (nl_catd)-1) return catd;
76	}
77	errno = ENOENT;
78	return (nl_catd)-1;
79}