home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Tricks of the Windows Gam…ming Gurus (2nd Edition)
/
Disc2.iso
/
vc98
/
crt
/
src
/
setlocal.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-06-17
|
17KB
|
555 lines
/***
*setlocal.c - Contains the setlocale function
*
* Copyright (c) 1988-1998, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Contains the setlocale() function.
*
*******************************************************************************/
#include <locale.h>
#if !defined (_WIN32)
static char _clocalestr[] = "C";
#else /* !defined (_WIN32) */
#include <cruntime.h>
#include <mtdll.h>
#include <malloc.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h> /* for strtol */
#include <setlocal.h>
#include <dbgint.h>
/* C locale */
static char _clocalestr[] = "C";
__declspec(selectany) struct {
const char * catname;
char * locale;
int (* init)(void);
} __lc_category[LC_MAX-LC_MIN+1] = {
/* code assumes locale initialization is "_clocalestr" */
{ "LC_ALL", NULL, __init_dummy /* never called */ },
{ "LC_COLLATE", _clocalestr, __init_collate },
{ "LC_CTYPE", _clocalestr, __init_ctype },
{ "LC_MONETARY",_clocalestr, __init_monetary },
{ "LC_NUMERIC", _clocalestr, __init_numeric },
{ "LC_TIME", _clocalestr, __init_time }
};
#ifdef _MT
/*
* Flag indicating whether or not setlocale() is active. Its value is the
* number of setlocale() calls currently active.
*/
_CRTIMP int __setlc_active;
/*
* Flag indicating whether or not a function which references the locale
* without having locked it is active. Its value is the number of such
* functions.
*/
_CRTIMP int __unguarded_readlc_active;
#endif /* _MT */
/* helper function prototypes */
char * _expandlocale(char *, char *, LC_ID *, UINT *, int);
void _strcats(char *, int, ...);
void __lc_lctostr(char *, const LC_STRINGS *);
int __lc_strtolc(LC_STRINGS *, const char *);
static char * __cdecl _setlocale_set_cat(int, const char *);
static char * __cdecl _setlocale_get_all(void);
#endif /* !defined (_WIN32) */
/***
*char * setlocale(int category, char *locale) - Set one or all locale categories
*
*Purpose:
* The setlocale() routine allows the user to set one or more of
* the locale categories to the specific locale selected by the
* user. [ANSI]
*
* NOTE: Under !_INTL, the C libraries only support the "C" locale.
* Attempts to change the locale will fail.
*
*Entry:
* int category = One of the locale categories defined in locale.h
* char *locale = String identifying a specific locale or NULL to
* query the current locale.
*
*Exit:
* If supplied locale pointer == NULL:
*
* Return pointer to current locale string and do NOT change
* the current locale.
*
* If supplied locale pointer != NULL:
*
* If locale string is '\0', set locale to default.
*
* If desired setting can be honored, return a pointer to the
* locale string for the appropriate category.
*
* If desired setting can NOT be honored, return NULL.
*
*Exceptions:
* Compound locale strings of the form "LC_COLLATE=xxx;LC_CTYPE=xxx;..."
* are allowed for the LC_ALL category. This is to support the ability
* to restore locales with the returned string, as specified by ANSI.
* Setting the locale with a compound locale string will succeed unless
* *all* categories failed. The returned string will reflect the current
* locale. For example, if LC_CTYPE fails in the above string, setlocale
* will return "LC_COLLATE=xxx;LC_CTYPE=yyy;..." where yyy is the
* previous locale (or the C locale if restoring the previous locale
* also failed). Unrecognized LC_* categories are ignored.
*
*******************************************************************************/
char * __cdecl setlocale (
int _category,
const char *_locale
)
#if !defined (_WIN32)
{
if ( (_locale == NULL) ||
(_locale[0] == '\0') ||
( (_locale[0]=='C') && (_locale[1]=='\0')) )
return(_clocalestr);
else
return(NULL);
}
#else /* !defined (_WIN32) */
{
char * retval;
#ifdef _MT
int local_lock_flag;
#endif /* _MT */
/* Validate category */
if ((_category < LC_MIN) || (_category > LC_MAX))
return NULL;
#ifdef _MT
/*
* Assert setlocale lock
*/
_mlock( _SETLOCALE_LOCK );
local_lock_flag = 1;
/*
* Increment flag that indicates a setlocale is active.
*/
__setlc_active++;
/*
* Wait until all unguarded locale read operations have completed.
*/
while ( __unguarded_readlc_active )
Sleep( 1 );
#endif /* _MT */
/* Interpret locale */
if (_category != LC_ALL)
{
retval = (_locale) ? _setlocale_set_cat(_category,_locale) :
__lc_category[_category].locale;
} else { /* LC_ALL */
char lctemp[MAX_LC_LEN];
int i;
int same = 1;
int fLocaleSet = 0; /* flag to indicate if anything successfully set */
if (_locale != NULL)
{
if ( (_locale[0]=='L') && (_locale[1]=='C') && (_locale[2]=='_') )
{
/* parse compound locale string */
size_t len;
const char * p = _locale; /* start of string to parse */
const char * s;
do {
s = strpbrk(p,"=;");
if ((s==(char *)NULL) || (!(len=s-p)) || (*s==';'))
{
#ifdef _MT
if ( local_lock_flag ) {
_munlock( _SETLOCALE_LOCK );
__setlc_active--;
}
#endif /* _MT */
return NULL; /* syntax error */
}
/* match with known LC_ strings, if possible, else ignore */
for (i=LC_ALL+1; i<=LC_MAX; i++)
{
if ((!strncmp(__lc_category[i].catname,p,len))
&& (len==strlen(__lc_category[i].catname)))
{
break; /* matched i */
}
} /* no match if (i>LC_MAX) -- just ignore */
if ((!(len = strcspn(++s,";"))) && (*s!=';'))
{
#ifdef _MT
if ( local_lock_flag ) {
_munlock( _SETLOCALE_LOCK );
__setlc_active--;
}
#endif /* _MT */
return NULL; /* syntax error */
}
if (i<=LC_MAX)
{
strncpy(lctemp, s, len);
lctemp[len]='\0'; /* null terminate string */
/* don't fail unless all categories fail */
if (_setlocale_set_cat(i,lctemp))
fLocaleSet++; /* record a success */
}
if (*(p = s+len)!='\0')
p++; /* skip ';', if present */
} while (*p);
retval = (fLocaleSet) ? _setlocale_get_all() : NULL;
} else { /* simple LC_ALL locale string */
/* confirm locale is supported, get expanded locale */
if (retval = _expandlocale((char *)_locale, lctemp, NULL, NULL, _category))
{
for (i=LC_MIN; i<=LC_MAX; i++)
{
if (i!=LC_ALL)
{
if (strcmp(lctemp, __lc_category[i].locale))
{
if (_setlocale_set_cat(i, lctemp))
{
fLocaleSet++; /* record a success */
}
else
{
same = 0; /* record a failure */
}
}
else
fLocaleSet++; /* trivial succcess */
}
}
if (same) /* needn't call setlocale_get_all() if all the same */
{
retval = _setlocale_get_all();
/* retval set above */
_free_crt(__lc_category[LC_ALL].locale);
__lc_category[LC_ALL].locale = NULL;
}
else
retval = (fLocaleSet) ? _setlocale_get_all() : NULL;
}
}
} else { /* LC_ALL & NULL */
retval = _setlocale_get_all ();
}
}
/* common exit point */
#ifdef _MT
if ( local_lock_flag ) {
_munlock( _SETLOCALE_LOCK );
__setlc_active--;
}
#endif /* _MT */
return retval;
} /* setlocale */
static char * __cdecl _setlocale_set_cat (
int category,
const char * locale
)
{
char * oldlocale;
LCID oldhandle;
UINT oldcodepage;
LC_ID oldid;
LC_ID idtemp;
UINT cptemp;
char lctemp[MAX_LC_LEN];
char * pch;
if (!_expandlocale((char *)locale, lctemp, &idtemp, &cptemp, category))
{
return NULL; /* unrecognized locale */
}
if (!(pch = (char *)_malloc_crt(strlen(lctemp)+1)))
{
return NULL; /* error if malloc fails */
}
oldlocale = __lc_category[category].locale; /* save for possible restore*/
oldhandle = __lc_handle[category];
memcpy((void *)&oldid, (void *)&__lc_id[category], sizeof(oldid));
oldcodepage = __lc_codepage;
/* update locale string */
__lc_category[category].locale = strcpy(pch,lctemp);
__lc_handle[category] = MAKELCID(idtemp.wLanguage, SORT_DEFAULT);
memcpy((void *)&__lc_id[category], (void *)&idtemp, sizeof(idtemp));
if (category==LC_CTYPE)
__lc_codepage = cptemp;
if ( category == LC_COLLATE )
__lc_collate_cp = cptemp;
if (__lc_category[category].init())
{
/* restore previous state! */
__lc_category[category].locale = oldlocale;
_free_crt(pch);
__lc_handle[category] = oldhandle;
__lc_codepage = oldcodepage;
return NULL; /* error if non-zero return */
}
/* locale set up successfully */
/* Cleanup */
if ((oldlocale != _clocalestr)
)
_free_crt(oldlocale);
return __lc_category[category].locale;
} /* _setlocale_set_cat */
static char * __cdecl _setlocale_get_all (
void
)
{
int i;
int same = 1;
/* allocate memory if necessary */
if (!__lc_category[LC_ALL].locale)
__lc_category[LC_ALL].locale =
_malloc_crt((MAX_LC_LEN+1) * (LC_MAX-LC_MIN+1) + CATNAMES_LEN);
__lc_category[LC_ALL].locale[0] = '\0';
for (i=LC_MIN+1; ; i++)
{
_strcats(__lc_category[LC_ALL].locale, 3, __lc_category[i].catname,"=",__lc_category[i].locale);
if (i<LC_MAX)
{
strcat(__lc_category[LC_ALL].locale,";");
if (strcmp(__lc_category[i].locale, __lc_category[i+1].locale))
same=0;
}
else
{
if (!same)
return __lc_category[LC_ALL].locale;
else
{
_free_crt(__lc_category[LC_ALL].locale);
__lc_category[LC_ALL].locale = (char *)NULL;
return __lc_category[LC_CTYPE].locale;
}
}
}
} /* _setlocale_get_all */
char * _expandlocale (
char *expr,
char * output,
LC_ID * id,
UINT * cp,
int category
)
{
static LC_ID cacheid = {0, 0, 0};
static UINT cachecp = 0;
static char cachein[MAX_LC_LEN] = "C";
static char cacheout[MAX_LC_LEN] = "C";
if (!expr)
return NULL; /* error if no input */
if (((*expr=='C') && (!expr[1]))
) /* for "C" locale, just return */
{
*output = 'C';
output[1] = '\0';
if (id)
{
id->wLanguage = 0;
id->wCountry = 0;
id->wCodePage = 0;
}
if (cp)
{
*cp = CP_ACP; /* return to ANSI code page */
}
return output; /* "C" */
}
/* first, make sure we didn't just do this one */
if (strcmp(cacheout,expr) && strcmp(cachein,expr))
{
/* do some real work */
LC_STRINGS names;
if (__lc_strtolc((LC_STRINGS *)&names, (const char *)expr))
return NULL; /* syntax error */
if (!__get_qualified_locale((LPLC_STRINGS)&names,
(LPLC_ID)&cacheid, (LPLC_STRINGS)&names))
return NULL; /* locale not recognized/supported */
/* begin: cache atomic section */
cachecp = cacheid.wCodePage;
__lc_lctostr((char *)cacheout, &names);
/* Don't cache "" empty string */
if (*expr)
strcpy(cachein, expr);
else
strcpy(cachein, cacheout);
/* end: cache atomic section */
}
if (id)
memcpy((void *)id, (void *)&cacheid, sizeof(cacheid)); /* possibly return LC_ID */
if (cp)
memcpy((void *)cp, (void *)&cachecp, sizeof(cachecp)); /* possibly return cp */
strcpy(output,cacheout);
return cacheout; /* return fully expanded locale string */
}
/* helpers */
int __cdecl __init_dummy(void) /* default routine for locale initializer */
{
return 0;
}
void _strcats
(
char *outstr,
int n,
...
)
{
int i;
va_list substr;
va_start (substr, n);
for (i =0; i<n; i++)
{
strcat(outstr, va_arg(substr, char *));
}
va_end(substr);
}
int __lc_strtolc
(
LC_STRINGS *names,
const char *locale
)
{
int i, len;
char ch;
memset((void *)names, '\0', sizeof(LC_STRINGS)); /* clear out result */
if (*locale=='\0')
return 0; /* trivial case */
/* only code page is given */
if (locale[0] == '.' && locale[1] != '\0')
{
strcpy((char *)names->szCodePage, &locale[1]);
return 0;
}
for (i=0; ; i++)
{
if (!(len=strcspn(locale,"_.,")))
return -1; /* syntax error */
ch = locale[len];
if ((i==0) && (len<MAX_LANG_LEN) && (ch!='.'))
strncpy((char *)names->szLanguage, locale, len);
else if ((i==1) && (len<MAX_CTRY_LEN) && (ch!='_'))
strncpy((char *)names->szCountry, locale, len);
else if ((i==2) && (ch=='\0' || ch==','))
strncpy((char *)names->szCodePage, locale, len);
else
return -1; /* error parsing locale string */
if (ch==',')
{
/* modifier not used in current implementation, but it
must be parsed to for POSIX/XOpen conformance */
/* strncpy(names->szModifier, locale, MAX_MODIFIER_LEN-1); */
break;
}
if (!ch)
break;
locale+=(len+1);
}
return 0;
}
void __lc_lctostr
(
char *locale,
const LC_STRINGS *names
)
{
strcpy(locale, (char *)names->szLanguage);
if (*(names->szCountry))
_strcats(locale, 2, "_", names->szCountry);
if (*(names->szCodePage))
_strcats(locale, 2, ".", names->szCodePage);
/* if (names->szModifier)
_strcats(locale, 2, ",", names->szModifier); */
}
#endif /* !defined (_WIN32) */