ref: 098632eacf994311f735ab9ef41548dfcc23abf4
dir: /src/m_misc.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 1993-2008 Raven Software
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// DESCRIPTION:
// Miscellaneous.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <io.h>
#ifdef _MSC_VER
#include <direct.h>
#endif
#else
#include <sys/stat.h>
#include <sys/types.h>
#endif
#include "doomtype.h"
#include "deh_str.h"
#include "i_swap.h"
#include "i_system.h"
#include "i_video.h"
#include "m_misc.h"
#include "v_video.h"
#include "w_wad.h"
#include "z_zone.h"
//
// Create a directory
//
void M_MakeDirectory(const char *path)
{
#ifdef _WIN32
mkdir(path);
#else
mkdir(path, 0755);
#endif
}
// Check if a file exists
boolean M_FileExists(const char *filename)
{
FILE *fstream;
fstream = fopen(filename, "r");
if (fstream != NULL)
{
fclose(fstream);
return true;
}
else
{
// If we can't open because the file is a directory, the
// "file" exists at least!
return errno == EISDIR;
}
}
// Check if a file exists by probing for common case variation of its filename.
// Returns a newly allocated string that the caller is responsible for freeing.
char *M_FileCaseExists(const char *path)
{
char *path_dup, *filename, *ext;
path_dup = M_StringDuplicate(path);
// 0: actual path
if (M_FileExists(path_dup))
{
return path_dup;
}
filename = strrchr(path_dup, DIR_SEPARATOR);
if (filename != NULL)
{
filename++;
}
else
{
filename = path_dup;
}
// 1: lowercase filename, e.g. doom2.wad
M_ForceLowercase(filename);
if (M_FileExists(path_dup))
{
return path_dup;
}
// 2: uppercase filename, e.g. DOOM2.WAD
M_ForceUppercase(filename);
if (M_FileExists(path_dup))
{
return path_dup;
}
// 3. uppercase basename with lowercase extension, e.g. DOOM2.wad
ext = strrchr(path_dup, '.');
if (ext != NULL && ext > filename)
{
M_ForceLowercase(ext + 1);
if (M_FileExists(path_dup))
{
return path_dup;
}
}
// 4. lowercase filename with uppercase first letter, e.g. Doom2.wad
if (strlen(filename) > 1)
{
M_ForceLowercase(filename + 1);
if (M_FileExists(path_dup))
{
return path_dup;
}
}
// 5. no luck
free(path_dup);
return NULL;
}
//
// Determine the length of an open file.
//
long M_FileLength(FILE *handle)
{
long savedpos;
long length;
// save the current position in the file
savedpos = ftell(handle);
// jump to the end and find the length
fseek(handle, 0, SEEK_END);
length = ftell(handle);
// go back to the old location
fseek(handle, savedpos, SEEK_SET);
return length;
}
//
// M_WriteFile
//
boolean M_WriteFile(const char *name, const void *source, int length)
{
FILE *handle;
int count;
handle = fopen(name, "wb");
if (handle == NULL)
return false;
count = fwrite(source, 1, length, handle);
fclose(handle);
if (count < length)
return false;
return true;
}
//
// M_ReadFile
//
int M_ReadFile(const char *name, byte **buffer)
{
FILE *handle;
int count, length;
byte *buf;
handle = fopen(name, "rb");
if (handle == NULL)
I_Error ("Couldn't read file %s", name);
// find the size of the file by seeking to the end and
// reading the current position
length = M_FileLength(handle);
buf = Z_Malloc (length + 1, PU_STATIC, NULL);
count = fread(buf, 1, length, handle);
fclose (handle);
if (count < length)
I_Error ("Couldn't read file %s", name);
buf[length] = '\0';
*buffer = buf;
return length;
}
// Returns the path to a temporary file of the given name, stored
// inside the system temporary directory.
//
// The returned value must be freed with Z_Free after use.
char *M_TempFile(const char *s)
{
const char *tempdir;
#ifdef _WIN32
// Check the TEMP environment variable to find the location.
tempdir = getenv("TEMP");
if (tempdir == NULL)
{
tempdir = ".";
}
#else
// In Unix, just use /tmp.
tempdir = "/tmp";
#endif
return M_StringJoin(tempdir, DIR_SEPARATOR_S, s, NULL);
}
boolean M_StrToInt(const char *str, int *result)
{
return sscanf(str, " 0x%x", (unsigned int *) result) == 1
|| sscanf(str, " 0X%x", (unsigned int *) result) == 1
|| sscanf(str, " 0%o", (unsigned int *) result) == 1
|| sscanf(str, " %d", result) == 1;
}
// Returns the directory portion of the given path, without the trailing
// slash separator character. If no directory is described in the path,
// the string "." is returned. In either case, the result is newly allocated
// and must be freed by the caller after use.
char *M_DirName(const char *path)
{
char *p, *result;
p = strrchr(path, DIR_SEPARATOR);
if (p == NULL)
{
return M_StringDuplicate(".");
}
else
{
result = M_StringDuplicate(path);
result[p - path] = '\0';
return result;
}
}
// Returns the base filename described by the given path (without the
// directory name). The result points inside path and nothing new is
// allocated.
const char *M_BaseName(const char *path)
{
const char *p;
p = strrchr(path, DIR_SEPARATOR);
if (p == NULL)
{
return path;
}
else
{
return p + 1;
}
}
void M_ExtractFileBase(const char *path, char *dest)
{
const char *src;
const char *filename;
int length;
src = path + strlen(path) - 1;
// back up until a \ or the start
while (src != path && *(src - 1) != DIR_SEPARATOR)
{
src--;
}
filename = src;
// Copy up to eight characters
// Note: Vanilla Doom exits with an error if a filename is specified
// with a base of more than eight characters. To remove the 8.3
// filename limit, instead we simply truncate the name.
length = 0;
memset(dest, 0, 8);
while (*src != '\0' && *src != '.')
{
if (length >= 8)
{
printf("Warning: Truncated '%s' lump name to '%.8s'.\n",
filename, dest);
break;
}
dest[length++] = toupper((int)*src++);
}
}
//---------------------------------------------------------------------------
//
// PROC M_ForceUppercase
//
// Change string to uppercase.
//
//---------------------------------------------------------------------------
void M_ForceUppercase(char *text)
{
char *p;
for (p = text; *p != '\0'; ++p)
{
*p = toupper(*p);
}
}
//---------------------------------------------------------------------------
//
// PROC M_ForceLowercase
//
// Change string to lowercase.
//
//---------------------------------------------------------------------------
void M_ForceLowercase(char *text)
{
char *p;
for (p = text; *p != '\0'; ++p)
{
*p = tolower(*p);
}
}
//
// M_StrCaseStr
//
// Case-insensitive version of strstr()
//
const char *M_StrCaseStr(const char *haystack, const char *needle)
{
unsigned int haystack_len;
unsigned int needle_len;
unsigned int len;
unsigned int i;
haystack_len = strlen(haystack);
needle_len = strlen(needle);
if (haystack_len < needle_len)
{
return NULL;
}
len = haystack_len - needle_len;
for (i = 0; i <= len; ++i)
{
if (!strncasecmp(haystack + i, needle, needle_len))
{
return haystack + i;
}
}
return NULL;
}
//
// Safe version of strdup() that checks the string was successfully
// allocated.
//
char *M_StringDuplicate(const char *orig)
{
char *result;
result = strdup(orig);
if (result == NULL)
{
I_Error("Failed to duplicate string (length %" PRIuPTR ")\n",
strlen(orig));
}
return result;
}
//
// String replace function.
//
char *M_StringReplace(const char *haystack, const char *needle,
const char *replacement)
{
char *result, *dst;
const char *p;
size_t needle_len = strlen(needle);
size_t result_len, dst_len;
// Iterate through occurrences of 'needle' and calculate the size of
// the new string.
result_len = strlen(haystack) + 1;
p = haystack;
for (;;)
{
p = strstr(p, needle);
if (p == NULL)
{
break;
}
p += needle_len;
result_len += strlen(replacement) - needle_len;
}
// Construct new string.
result = malloc(result_len);
if (result == NULL)
{
I_Error("M_StringReplace: Failed to allocate new string");
return NULL;
}
dst = result; dst_len = result_len;
p = haystack;
while (*p != '\0')
{
if (!strncmp(p, needle, needle_len))
{
M_StringCopy(dst, replacement, dst_len);
p += needle_len;
dst += strlen(replacement);
dst_len -= strlen(replacement);
}
else
{
*dst = *p;
++dst; --dst_len;
++p;
}
}
*dst = '\0';
return result;
}
// Safe string copy function that works like OpenBSD's strlcpy().
// Returns true if the string was not truncated.
boolean M_StringCopy(char *dest, const char *src, size_t dest_size)
{
size_t len;
if (dest_size >= 1)
{
dest[dest_size - 1] = '\0';
strncpy(dest, src, dest_size - 1);
}
else
{
return false;
}
len = strlen(dest);
return src[len] == '\0';
}
// Safe string concat function that works like OpenBSD's strlcat().
// Returns true if string not truncated.
boolean M_StringConcat(char *dest, const char *src, size_t dest_size)
{
size_t offset;
offset = strlen(dest);
if (offset > dest_size)
{
offset = dest_size;
}
return M_StringCopy(dest + offset, src, dest_size - offset);
}
// Returns true if 's' begins with the specified prefix.
boolean M_StringStartsWith(const char *s, const char *prefix)
{
return strlen(s) >= strlen(prefix)
&& strncmp(s, prefix, strlen(prefix)) == 0;
}
// Returns true if 's' ends with the specified suffix.
boolean M_StringEndsWith(const char *s, const char *suffix)
{
return strlen(s) >= strlen(suffix)
&& strcmp(s + strlen(s) - strlen(suffix), suffix) == 0;
}
// Return a newly-malloced string with all the strings given as arguments
// concatenated together.
char *M_StringJoin(const char *s, ...)
{
char *result;
const char *v;
va_list args;
size_t result_len;
result_len = strlen(s) + 1;
va_start(args, s);
for (;;)
{
v = va_arg(args, const char *);
if (v == NULL)
{
break;
}
result_len += strlen(v);
}
va_end(args);
result = malloc(result_len);
if (result == NULL)
{
I_Error("M_StringJoin: Failed to allocate new string.");
return NULL;
}
M_StringCopy(result, s, result_len);
va_start(args, s);
for (;;)
{
v = va_arg(args, const char *);
if (v == NULL)
{
break;
}
M_StringConcat(result, v, result_len);
}
va_end(args);
return result;
}
// On Windows, vsnprintf() is _vsnprintf().
#ifdef _WIN32
#if _MSC_VER < 1400 /* not needed for Visual Studio 2008 */
#define vsnprintf _vsnprintf
#endif
#endif
// Safe, portable vsnprintf().
int M_vsnprintf(char *buf, size_t buf_len, const char *s, va_list args)
{
int result;
if (buf_len < 1)
{
return 0;
}
// Windows (and other OSes?) has a vsnprintf() that doesn't always
// append a trailing \0. So we must do it, and write into a buffer
// that is one byte shorter; otherwise this function is unsafe.
result = vsnprintf(buf, buf_len, s, args);
// If truncated, change the final char in the buffer to a \0.
// A negative result indicates a truncated buffer on Windows.
if (result < 0 || result >= buf_len)
{
buf[buf_len - 1] = '\0';
result = buf_len - 1;
}
return result;
}
// Safe, portable snprintf().
int M_snprintf(char *buf, size_t buf_len, const char *s, ...)
{
va_list args;
int result;
va_start(args, s);
result = M_vsnprintf(buf, buf_len, s, args);
va_end(args);
return result;
}
#ifdef _WIN32
char *M_OEMToUTF8(const char *oem)
{
unsigned int len = strlen(oem) + 1;
wchar_t *tmp;
char *result;
tmp = malloc(len * sizeof(wchar_t));
MultiByteToWideChar(CP_OEMCP, 0, oem, len, tmp, len);
result = malloc(len * 4);
WideCharToMultiByte(CP_UTF8, 0, tmp, len, result, len * 4, NULL, NULL);
free(tmp);
return result;
}
#endif