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150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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compat: Some compatibility functions.
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The mpg123 code is determined to keep it's legacy. A legacy of old, old UNIX.
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So anything possibly somewhat advanced should be considered to be put here, with proper #ifdef;-)
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copyright 2007-8 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Thomas Orgis, Windows Unicode stuff by JonY.
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*/
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#include "config.h"
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#include "compat.h"
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#ifdef _MSC_VER
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#include <io.h>
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#else
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#include <fcntl.h>
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#endif
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#ifdef WANT_WIN32_UNICODE
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#include <wchar.h>
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#include <windows.h>
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#include <winnls.h>
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#endif
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#include "debug.h"
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/* A safe realloc also for very old systems where realloc(NULL, size) returns NULL. */
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void *safe_realloc(void *ptr, size_t size)
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{
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if(ptr == NULL) return malloc(size);
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else return realloc(ptr, size);
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}
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#ifndef HAVE_STRERROR
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const char *strerror(int errnum)
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{
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extern int sys_nerr;
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extern char *sys_errlist[];
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return (errnum < sys_nerr) ? sys_errlist[errnum] : "";
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}
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#endif
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#ifndef HAVE_STRDUP
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char *strdup(const char *src)
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{
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char *dest;
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if (!(dest = (char *) malloc(strlen(src)+1)))
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return NULL;
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else
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return strcpy(dest, src);
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}
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#endif
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int compat_open(const char *filename, int mode)
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{
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int ret;
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#if defined (WANT_WIN32_UNICODE)
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const wchar_t *frag = NULL;
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ret = win32_utf8_wide(filename, &frag, NULL);
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if ((frag == NULL) || (ret == 0)) goto fallback; /* Fallback to plain open when ucs-2 conversion fails */
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ret = _wopen(frag, mode); /*Try _wopen */
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if (ret != -1 ) goto open_ok; /* msdn says -1 means failure */
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fallback:
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#endif
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#ifdef __MSVCRT__ /* MSDN says POSIX function is deprecated beginning in Visual C++ 2005 */
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ret = _open (filename, mode); /* Try plain old _open(), if it fails, do nothing */
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#else
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ret = open (filename, mode);
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#endif
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#if defined (WANT_WIN32_UNICODE)
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open_ok:
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free ((void *)frag); /* Freeing a NULL should be OK */
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#endif
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return ret;
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}
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int compat_close(int infd)
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{
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#ifdef __MSVCRT__ /* MSDN says POSIX function is deprecated beginning in Visual C++ 2005 */
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return _close(infd);
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#else
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return close(infd);
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#endif
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}
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/* Windows Unicode stuff */
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#ifdef WANT_WIN32_UNICODE
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int win32_wide_utf8(const wchar_t * const wptr, const char **const mbptr, size_t * const buflen)
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{
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size_t len;
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char *buf;
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int ret;
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len = WideCharToMultiByte(CP_UTF8, 0, wptr, -1, NULL, 0, NULL, NULL); /* Get utf-8 string length */
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buf = calloc(len, sizeof (char)); /* Can we assume sizeof char always = 1? */
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debug2("win32_wide_utf8 allocated %u bytes at %p", len, buf);
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if(buf != NULL)
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{
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ret = WideCharToMultiByte(CP_UTF8, 0, wptr, -1, buf, len, NULL, NULL); /*Do actual conversion*/
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*mbptr = buf; /* Set string pointer to allocated buffer */
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if(buflen != NULL) *buflen = len * sizeof (char); /* Give length of allocated memory if needed. */
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return ret;
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}
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else
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{
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if(buflen != NULL) *buflen = 0;
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return 0;
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}
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}
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int win32_utf8_wide(const char *const mbptr, const wchar_t ** const wptr, size_t * const buflen)
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{
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size_t len;
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wchar_t *buf;
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int ret;
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len = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, mbptr, -1, NULL, 0); /* Get converted size */
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buf = calloc(len, sizeof (wchar_t)); /* Allocate memory accordingly */
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debug2("win32_utf8_wide allocated %u bytes at %p", len, buf);
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if(buf != NULL)
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{
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ret = MultiByteToWideChar (CP_UTF8, MB_ERR_INVALID_CHARS, mbptr, -1, buf, len); /* Do conversion */
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*wptr = buf; /* Set string pointer to allocated buffer */
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if (buflen != NULL) *buflen = len * sizeof (wchar_t); /* Give length of allocated memory if needed. */
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return ret;
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}
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else
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{
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if (buflen != NULL) *buflen = 0;
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return 0;
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}
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}
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#endif
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