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fopen Windows wrapper to support reading UTF-8 encoded files

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This commit is contained in:
Manoj Ampalam 2016-10-09 23:29:52 -07:00
parent f7e30c7d2e
commit fe53a4100a
3 changed files with 51 additions and 0 deletions
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2
contrib/win32/win32compat/inc/unistd.h
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@ -35,6 +35,8 @@
#define getdtablesize() MAX_FDS
#define fopen w32_fopen_utf8
/* Compatibility header to avoid lots of #ifdefs in includes.h on Win32 */
#include <conio.h>

1
contrib/win32/win32compat/inc/w32posix.h
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@ -69,6 +69,7 @@ sighandler_t w32_signal(int signum, sighandler_t handler);
int w32_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
int w32_raise(int sig);
int w32_kill(int pid, int sig);
FILE* w32_fopen_utf8(const char *, const char *);
/* Shutdown constants */

48
contrib/win32/win32compat/misc.c
View File

@ -1,4 +1,5 @@
#include <Windows.h>
#include <stdio.h>
#include "inc\defs.h"
#include "inc\sys\statvfs.h"
@ -69,4 +70,51 @@ int dlclose(HMODULE handle) {
FARPROC dlsym(HMODULE handle, const char *symbol) {
return GetProcAddress(handle, symbol);
}
/*fopen on Windows to mimic https://linux.die.net/man/3/fopen
* only r, w, a are supported for now
*/
FILE*
w32_fopen_utf8(const char *path, const char *mode) {
wchar_t wpath[MAX_PATH], wmode[5];
FILE* f;
char utf8_bom[] = { 0xEF,0xBB,0xBF };
char first3_bytes[3];
if (mode[1] != '\0') {
errno = ENOTSUP;
return NULL;
}
if (MultiByteToWideChar(CP_UTF8, 0, path, -1, wpath, MAX_PATH) == 0 ||
MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, 5) == 0) {
errno = EFAULT;
debug("WideCharToMultiByte failed for %c - ERROR:%d", path, GetLastError());
return NULL;
}
f = _wfopen(wpath, wmode);
if (f) {
/* BOM adjustments for file streams*/
if (mode[0] == 'w' && fseek(f, 0, SEEK_SET) != EBADF) {
/* write UTF-8 BOM - should we ?*/
/*if (fwrite(utf8_bom, sizeof(utf8_bom), 1, f) != 1) {
fclose(f);
return NULL;
}*/
}
else if (mode[0] == 'r' && fseek(f, 0, SEEK_SET) != EBADF) {
/* read out UTF-8 BOM if present*/
if (fread(first3_bytes, 3, 1, f) != 1 ||
memcmp(first3_bytes, utf8_bom, 3) != 0) {
fseek(f, 0, SEEK_SET);
}
}
}
return f;
}