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catopen.c    218 lines (195 with data), 5.2 kB

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/* catopen.c - aeb, 960107 */
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <nl_types.h>
/* if we don't have the strchr() function,
* then we must fall back to using the older index() function,
* but (apparently) this isn't always prototyped in string.h
*/
#ifndef index
/* i.e. NOT using strchr()
*/
extern char *index (const char *, int);
#endif
extern char *my_malloc(int); /* in util.c */
#ifndef DEFAULT_NLSPATH
# if __GLIBC__ >= 2
# define DEFAULT_NLSPATH "/usr/share/locale/%L/%N"
# else
# define DEFAULT_NLSPATH "/usr/lib/locale/%N/%L"
# endif
#endif
static nl_catd my_catopenpath(char *name, char *path);
static /* this source included in gripes.c */
nl_catd
my_catopen(char *name, int oflag) {
nl_catd fd;
fd = catopen(name, oflag);
if (fd == (nl_catd) -1 && oflag) {
oflag = 0;
fd = catopen(name, oflag);
}
if (fd == (nl_catd) -1) {
char *nlspath;
/* The libc catopen fails - let us see if we can do better */
/* The quotes below are from X/Open, XPG 1987, Vol. 3. */
/*
* "In catopen(), the oflag argument is reserved for future use
* and should be set to 0."
*/
if (oflag)
return fd; /* only treat the known case */
/*
* "If `name' contains a `/', then `name' specifies a pathname"
*/
if (index(name, '/')) {
#ifdef __GLIBC__
/* glibc uses a pointer type for nl_catd, not a fd */
return fd;
#else
/* this works under libc5 */
return open(name, O_RDONLY);
#endif
}
/*
* "If NLSPATH does not exist in the environment, or if a
* message catalog cannot be opened in any of the paths specified
* by NLSPATH, then an implementation defined default path is used"
*/
nlspath = getenv("NLSPATH");
if (nlspath)
fd = my_catopenpath(name, nlspath);
if (fd == (nl_catd) -1)
fd = my_catopenpath(name, DEFAULT_NLSPATH);
}
return fd;
}
/*
* XPG 1987, Vol. 3, Section 4.4 specifies the environment
* variable NLSPATH (example:
* NLSPATH=/nlslib/%L/%N.cat:/nlslib/%N/%L
* where %L stands for the value of the environment variable LANG,
* and %N stands for the `name' argument of catopen().
* The environ(5) page specifies more precisely that
* LANG is of the form
* LANG=language[_territory[.codeset]]
* and adds %l, %t, %c for the three parts of LANG, without the
* _ or . and are NULL when these parts are missing.
* It also specifies %% for a single % sign.
* A leading colon, or a pair of adjacent colons, in NLSPATH
* specifies the current directory. (Meant is that "" stands for "%N".)
*
*/
static nl_catd
my_catopenpath(char *name, char *nlspath) {
int fd;
nl_catd cfd = (nl_catd) -1;
char *path0, *path, *s, *file, *lang, *lang_l, *lang_t, *lang_c;
int langsz, namesz, sz, lang_l_sz, lang_t_sz, lang_c_sz;
namesz = strlen(name);
lang = getenv("LANG");
if (!lang)
lang = "";
langsz = strlen(lang);
lang_l = lang;
s = index(lang_l, '_');
if (!s) {
lang_t = lang_c = "";
lang_l_sz = langsz;
lang_t_sz = lang_c_sz = 0;
} else {
lang_l_sz = s - lang_l;
lang_t = s+1;
s = index(lang_t, '.');
if (!s) {
lang_c = "";
lang_t_sz = langsz - lang_l_sz - 1;
lang_c_sz = 0;
} else {
lang_t_sz = s - lang_t;
lang_c = s+1;
lang_c_sz = langsz - lang_l_sz - lang_t_sz - 2;
}
}
/* figure out how much room we have to malloc() */
sz = 0;
s = nlspath;
while(*s) {
if(*s == '%') {
s++;
switch(*s) {
case '%':
sz++; break;
case 'N':
sz += namesz; break;
case 'L':
sz += langsz; break;
case 'l':
sz += lang_l_sz; break;
case 't':
sz += lang_t_sz; break;
case 'c':
sz += lang_c_sz; break;
default: /* unknown escape - ignore */
break;
}
} else if (*s == ':' && (s == nlspath || s[-1] == ':')) {
sz += (namesz + 1);
} else
sz++;
s++;
}
/* expand the %L and %N escapes */
path0 = my_malloc(sz + 1);
path = path0;
s = nlspath;
while(*s) {
if(*s == '%') {
s++;
switch(*s) {
case '%':
*path++ = '%'; break;
case 'N':
strncpy(path, name, namesz); path += namesz; break;
case 'L':
strncpy(path, lang, langsz); path += langsz; break;
case 'l':
strncpy(path, lang_l, lang_l_sz); path += lang_l_sz; break;
case 't':
strncpy(path, lang_t, lang_t_sz); path += lang_t_sz; break;
case 'c':
strncpy(path, lang_c, lang_c_sz); path += lang_c_sz; break;
default: /* unknown escape - ignore */
break;
}
} else if (*s == ':' && (s == nlspath || s[-1] == ':')) {
strncpy(path, name, namesz); path += namesz;
*path++ = ':';
} else
*path++ = *s;
s++;
}
*path = 0;
path = path0;
while(path) {
file = path;
s = index(path, ':');
if (s) {
*s = 0;
path = s+1;
} else
path = 0;
fd = open(file, O_RDONLY);
if (fd != -1) {
/* we found the right catalog - but we don't know the
type of nl_catd, so close it again and ask libc */
close(fd);
cfd = catopen(file, 0);
break;
}
}
free(path0);
return cfd;
}