SDL_string.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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/* This file contains portable string manipulation functions for SDL */
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#include "SDL_stdinc.h"
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#define SDL_isupperhex(X) (((X) >= 'A') && ((X) <= 'F'))
#define SDL_islowerhex(X) (((X) >= 'a') && ((X) <= 'f'))
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#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOL)
static size_t SDL_ScanLong(const char *text, int radix, long *valuep)
{
const char *textstart = text;
long value = 0;
SDL_bool negative = SDL_FALSE;
if ( *text == '-' ) {
negative = SDL_TRUE;
++text;
}
if ( radix == 16 && SDL_strncmp(text, "0x", 2) == 0 ) {
text += 2;
}
for ( ; ; ) {
int v;
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if ( SDL_isdigit((unsigned char) *text) ) {
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v = *text - '0';
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} else if ( radix == 16 && SDL_isupperhex(*text) ) {
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v = 10 + (*text - 'A');
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} else if ( radix == 16 && SDL_islowerhex(*text) ) {
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v = 10 + (*text - 'a');
} else {
break;
}
value *= radix;
value += v;
++text;
}
if ( valuep ) {
if ( negative && value ) {
*valuep = -value;
} else {
*valuep = value;
}
}
return (text - textstart);
}
#endif
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#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD)
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static size_t SDL_ScanUnsignedLong(const char *text, int radix, unsigned long *valuep)
{
const char *textstart = text;
unsigned long value = 0;
if ( radix == 16 && SDL_strncmp(text, "0x", 2) == 0 ) {
text += 2;
}
for ( ; ; ) {
int v;
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if ( SDL_isdigit((unsigned char) *text) ) {
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v = *text - '0';
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} else if ( radix == 16 && SDL_isupperhex(*text) ) {
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v = 10 + (*text - 'A');
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} else if ( radix == 16 && SDL_islowerhex(*text) ) {
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v = 10 + (*text - 'a');
} else {
break;
}
value *= radix;
value += v;
++text;
}
if ( valuep ) {
*valuep = value;
}
return (text - textstart);
}
#endif
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#ifndef HAVE_SSCANF
static size_t SDL_ScanUintPtrT(const char *text, int radix, uintptr_t *valuep)
{
const char *textstart = text;
uintptr_t value = 0;
if ( radix == 16 && SDL_strncmp(text, "0x", 2) == 0 ) {
text += 2;
}
for ( ; ; ) {
int v;
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if ( SDL_isdigit((unsigned char) *text) ) {
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v = *text - '0';
} else if ( radix == 16 && SDL_isupperhex(*text) ) {
v = 10 + (*text - 'A');
} else if ( radix == 16 && SDL_islowerhex(*text) ) {
v = 10 + (*text - 'a');
} else {
break;
}
value *= radix;
value += v;
++text;
}
if ( valuep ) {
*valuep = value;
}
return (text - textstart);
}
#endif
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#ifdef SDL_HAS_64BIT_TYPE
#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOLL)
static size_t SDL_ScanLongLong(const char *text, int radix, Sint64 *valuep)
{
const char *textstart = text;
Sint64 value = 0;
SDL_bool negative = SDL_FALSE;
if ( *text == '-' ) {
negative = SDL_TRUE;
++text;
}
if ( radix == 16 && SDL_strncmp(text, "0x", 2) == 0 ) {
text += 2;
}
for ( ; ; ) {
int v;
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if ( SDL_isdigit((unsigned char) *text) ) {
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v = *text - '0';
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} else if ( radix == 16 && SDL_isupperhex(*text) ) {
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v = 10 + (*text - 'A');
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} else if ( radix == 16 && SDL_islowerhex(*text) ) {
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v = 10 + (*text - 'a');
} else {
break;
}
value *= radix;
value += v;
++text;
}
if ( valuep ) {
if ( negative && value ) {
*valuep = -value;
} else {
*valuep = value;
}
}
return (text - textstart);
}
#endif
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#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOULL)
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static size_t SDL_ScanUnsignedLongLong(const char *text, int radix, Uint64 *valuep)
{
const char *textstart = text;
Uint64 value = 0;
if ( radix == 16 && SDL_strncmp(text, "0x", 2) == 0 ) {
text += 2;
}
for ( ; ; ) {
int v;
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if ( SDL_isdigit((unsigned char) *text) ) {
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v = *text - '0';
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} else if ( radix == 16 && SDL_isupperhex(*text) ) {
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v = 10 + (*text - 'A');
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} else if ( radix == 16 && SDL_islowerhex(*text) ) {
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v = 10 + (*text - 'a');
} else {
break;
}
value *= radix;
value += v;
++text;
}
if ( valuep ) {
*valuep = value;
}
return (text - textstart);
}
#endif
#endif /* SDL_HAS_64BIT_TYPE */
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#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOD)
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static size_t SDL_ScanFloat(const char *text, double *valuep)
{
const char *textstart = text;
unsigned long lvalue = 0;
double value = 0.0;
SDL_bool negative = SDL_FALSE;
if ( *text == '-' ) {
negative = SDL_TRUE;
++text;
}
text += SDL_ScanUnsignedLong(text, 10, &lvalue);
value += lvalue;
if ( *text == '.' ) {
int mult = 10;
++text;
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while ( SDL_isdigit((unsigned char) *text) ) {
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lvalue = *text - '0';
value += (double)lvalue / mult;
mult *= 10;
++text;
}
}
if ( valuep ) {
if ( negative && value ) {
*valuep = -value;
} else {
*valuep = value;
}
}
return (text - textstart);
}
#endif
#ifndef SDL_memset
void *SDL_memset(void *dst, int c, size_t len)
{
size_t left = (len % 4);
if ( len >= 4 ) {
Uint32 value = 0;
Uint32 *dstp = (Uint32 *)dst;
int i;
for (i = 0; i < 4; ++i) {
value <<= 8;
value |= c;
}
len /= 4;
while ( len-- ) {
*dstp++ = value;
}
}
if ( left > 0 ) {
Uint8 value = (Uint8)c;
Uint8 *dstp = (Uint8 *)dst;
switch(left) {
case 3:
*dstp++ = value;
case 2:
*dstp++ = value;
case 1:
*dstp++ = value;
}
}
return dst;
}
#endif
#ifndef SDL_memcpy
void *SDL_memcpy(void *dst, const void *src, size_t len)
{
char *srcp = (char *)src;
char *dstp = (char *)dst;
while ( len-- ) {
*dstp++ = *srcp++;
}
return dst;
}
#endif
#ifndef SDL_revcpy
void *SDL_revcpy(void *dst, const void *src, size_t len)
{
char *srcp = (char *)src;
char *dstp = (char *)dst;
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srcp += len-1;
dstp += len-1;
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while ( len-- ) {
*dstp-- = *srcp--;
}
return dst;
}
#endif
#ifndef SDL_memcmp
int SDL_memcmp(const void *s1, const void *s2, size_t len)
{
char *s1p = (char *)s1;
char *s2p = (char *)s2;
while ( len-- ) {
if ( *s1p != *s2p ) {
return (*s1p - *s2p);
}
++s1p;
++s2p;
}
return 0;
}
#endif
#ifndef HAVE_STRLEN
size_t SDL_strlen(const char *string)
{
size_t len = 0;
while ( *string++ ) {
++len;
}
return len;
}
#endif
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#ifndef HAVE_STRLCPY
size_t SDL_strlcpy(char *dst, const char *src, size_t maxlen)
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size_t srclen = SDL_strlen(src);
if ( maxlen > 0 ) {
size_t len = SDL_min(srclen, maxlen-1);
SDL_memcpy(dst, src, len);
dst[len] = '\0';
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return srclen;
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#ifndef HAVE_STRLCAT
size_t SDL_strlcat(char *dst, const char *src, size_t maxlen)
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size_t dstlen = SDL_strlen(dst);
size_t srclen = SDL_strlen(src);
if ( dstlen < maxlen ) {
SDL_strlcpy(dst+dstlen, src, maxlen-dstlen);
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return dstlen+srclen;
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#ifndef HAVE_STRDUP
char *SDL_strdup(const char *string)
{
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size_t len = SDL_strlen(string)+1;
char *newstr = SDL_malloc(len);
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if ( newstr ) {
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SDL_strlcpy(newstr, string, len);
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}
return newstr;
}
#endif
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#ifndef HAVE__STRREV
char *SDL_strrev(char *string)
{
size_t len = SDL_strlen(string);
char *a = &string[0];
char *b = &string[len-1];
len /= 2;
while ( len-- ) {
char c = *a;
*a++ = *b;
*b-- = c;
}
return string;
}
#endif
#ifndef HAVE__STRUPR
char *SDL_strupr(char *string)
{
char *bufp = string;
while ( *bufp ) {
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*bufp = SDL_toupper((unsigned char) *bufp);
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++bufp;
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}
return string;
}
#endif
#ifndef HAVE__STRLWR
char *SDL_strlwr(char *string)
{
char *bufp = string;
while ( *bufp ) {
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*bufp = SDL_tolower((unsigned char) *bufp);
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++bufp;
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}
return string;
}
#endif
#ifndef HAVE_STRCHR
char *SDL_strchr(const char *string, int c)
{
while ( *string ) {
if ( *string == c ) {
return (char *)string;
}
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++string;
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}
return NULL;
}
#endif
#ifndef HAVE_STRRCHR
char *SDL_strrchr(const char *string, int c)
{
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const char *bufp = string + SDL_strlen(string) - 1;
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while ( bufp >= string ) {
if ( *bufp == c ) {
return (char *)bufp;
}
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--bufp;
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}
return NULL;
}
#endif
#ifndef HAVE_STRSTR
char *SDL_strstr(const char *haystack, const char *needle)
{
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size_t length = SDL_strlen(needle);
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while ( *haystack ) {
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if ( SDL_strncmp(haystack, needle, length) == 0 ) {
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return (char *)haystack;
}
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++haystack;
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}
return NULL;
}
#endif
#if !defined(HAVE__LTOA) || !defined(HAVE__I64TOA) || \
!defined(HAVE__ULTOA) || !defined(HAVE__UI64TOA)
static const char ntoa_table[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z'
};
#endif /* ntoa() conversion table */
#ifndef HAVE__LTOA
char *SDL_ltoa(long value, char *string, int radix)
{
char *bufp = string;
if ( value < 0 ) {
*bufp++ = '-';
value = -value;
}
if ( value ) {
while ( value > 0 ) {
*bufp++ = ntoa_table[value % radix];
value /= radix;
}
} else {
*bufp++ = '0';
}
*bufp = '\0';
/* The numbers went into the string backwards. :) */
if ( *string == '-' ) {
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SDL_strrev(string+1);
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SDL_strrev(string);
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}
return string;
}
#endif
#ifndef HAVE__ULTOA
char *SDL_ultoa(unsigned long value, char *string, int radix)
{
char *bufp = string;
if ( value ) {
while ( value > 0 ) {
*bufp++ = ntoa_table[value % radix];
value /= radix;
}
} else {
*bufp++ = '0';
}
*bufp = '\0';
/* The numbers went into the string backwards. :) */
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SDL_strrev(string);
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return string;
}
#endif
#ifndef HAVE_STRTOL
long SDL_strtol(const char *string, char **endp, int base)
{
size_t len;
long value;
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if ( !base ) {
if ( (SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0) ) {
base = 16;
} else {
base = 10;
}
}
len = SDL_ScanLong(string, base, &value);
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if ( endp ) {
*endp = (char *)string + len;
}
return value;
}
#endif
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#ifndef HAVE_STRTOUL
unsigned long SDL_strtoul(const char *string, char **endp, int base)
{
size_t len;
unsigned long value;
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if ( !base ) {
if ( (SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0) ) {
base = 16;
} else {
base = 10;
}
}
len = SDL_ScanUnsignedLong(string, base, &value);
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if ( endp ) {
*endp = (char *)string + len;
}
return value;
}
#endif
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#ifdef SDL_HAS_64BIT_TYPE
#ifndef HAVE__I64TOA
char *SDL_lltoa(Sint64 value, char *string, int radix)
{
char *bufp = string;
if ( value < 0 ) {
*bufp++ = '-';
value = -value;
}
if ( value ) {
while ( value > 0 ) {
*bufp++ = ntoa_table[value % radix];
value /= radix;
}
} else {
*bufp++ = '0';
}
*bufp = '\0';
/* The numbers went into the string backwards. :) */
if ( *string == '-' ) {
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SDL_strrev(string+1);
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SDL_strrev(string);
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}
return string;
}
#endif
#ifndef HAVE__UI64TOA
char *SDL_ulltoa(Uint64 value, char *string, int radix)
{
char *bufp = string;
if ( value ) {
while ( value > 0 ) {
*bufp++ = ntoa_table[value % radix];
value /= radix;
}
} else {
*bufp++ = '0';
}
*bufp = '\0';
/* The numbers went into the string backwards. :) */
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SDL_strrev(string);
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return string;
}
#endif
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#if !defined(HAVE_STRTOLL) && !defined(HAVE__STRTOI64)
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Sint64 SDL_strtoll(const char *string, char **endp, int base)
{
size_t len;
Sint64 value;
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if ( !base ) {
if ( (SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0) ) {
base = 16;
} else {
base = 10;
}
}
len = SDL_ScanLongLong(string, base, &value);
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if ( endp ) {
*endp = (char *)string + len;
}
return value;
}
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#elif defined(__WIN32__) /* so that the export won't be missing */
#undef SDL_strtoll
DECLSPEC Sint64 SDLCALL SDL_strtoll(const char *string, char **endp, int base) {
#ifdef HAVE__STRTOI64
return _strtoi64 (string, endp, base);
#else
return strtoll (string, endp, base);
#endif
}
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#if !defined(HAVE_STRTOULL) && !defined(HAVE__STRTOUI64)
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Uint64 SDL_strtoull(const char *string, char **endp, int base)
{
size_t len;
Uint64 value;
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if ( !base ) {
if ( (SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0) ) {
base = 16;
} else {
base = 10;
}
}
len = SDL_ScanUnsignedLongLong(string, base, &value);
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if ( endp ) {
*endp = (char *)string + len;
}
return value;
}
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#elif defined(__WIN32__) /* so that the export won't be missing */
#undef SDL_strtoull
DECLSPEC Uint64 SDLCALL SDL_strtoull(const char *string, char **endp, int base) {
#ifdef HAVE__STRTOUI64
return _strtoui64(string, endp, base);
#else
return strtoull(string, endp, base);
#endif
}
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#endif
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#endif /* SDL_HAS_64BIT_TYPE */
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#ifndef HAVE_STRTOD
double SDL_strtod(const char *string, char **endp)
{
size_t len;
double value;
len = SDL_ScanFloat(string, &value);
if ( endp ) {
*endp = (char *)string + len;
}
return value;
}
#endif
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#ifndef HAVE_STRCMP
int SDL_strcmp(const char *str1, const char *str2)
{
while (*str1 && *str2) {
if ( *str1 != *str2 )
break;
++str1;
++str2;
}
return (int)((unsigned char)*str1 - (unsigned char)*str2);
}
#endif
#ifndef HAVE_STRNCMP
int SDL_strncmp(const char *str1, const char *str2, size_t maxlen)
{
while ( *str1 && *str2 && maxlen ) {
if ( *str1 != *str2 )
break;
++str1;
++str2;
--maxlen;
}
if ( ! maxlen ) {
return 0;
}
return (int)((unsigned char)*str1 - (unsigned char)*str2);
}
#endif
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#if !defined(HAVE_STRCASECMP) && !defined(HAVE__STRICMP)
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int SDL_strcasecmp(const char *str1, const char *str2)
{
char a = 0;
char b = 0;
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while ( *str1 && *str2 ) {
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a = SDL_tolower((unsigned char) *str1);
b = SDL_tolower((unsigned char) *str2);
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if ( a != b )
break;
++str1;
++str2;
}
return (int)((unsigned char)a - (unsigned char)b);
}
#endif
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#if !defined(HAVE_STRNCASECMP) && !defined(HAVE__STRNICMP)
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int SDL_strncasecmp(const char *str1, const char *str2, size_t maxlen)
{
char a = 0;
char b = 0;
while ( *str1 && *str2 && maxlen ) {
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a = SDL_tolower((unsigned char) *str1);
b = SDL_tolower((unsigned char) *str2);
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if ( a != b )
break;
++str1;
++str2;
--maxlen;
}
return (int)((unsigned char)a - (unsigned char)b);
}
#endif
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#ifndef HAVE_SSCANF
int SDL_sscanf(const char *text, const char *fmt, ...)
{
va_list ap;
int retval = 0;
va_start(ap, fmt);
while ( *fmt ) {
if ( *fmt == ' ' ) {
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while ( SDL_isspace((unsigned char) *text) ) {
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++text;
}
++fmt;
continue;
}
if ( *fmt == '%' ) {
SDL_bool done = SDL_FALSE;
long count = 0;
int radix = 10;
enum {
DO_SHORT,
DO_INT,
DO_LONG,
DO_LONGLONG
} inttype = DO_INT;
SDL_bool suppress = SDL_FALSE;
++fmt;
if ( *fmt == '%' ) {
if ( *text == '%' ) {
++text;
++fmt;
continue;
}
break;
}
if ( *fmt == '*' ) {
suppress = SDL_TRUE;
++fmt;
}
fmt += SDL_ScanLong(fmt, 10, &count);
if ( *fmt == 'c' ) {
if ( ! count ) {
count = 1;
}
if ( suppress ) {
while ( count-- ) {
++text;
}
} else {
char *valuep = va_arg(ap, char*);
while ( count-- ) {
*valuep++ = *text++;
}
++retval;
}
continue;
}
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while ( SDL_isspace((unsigned char) *text) ) {
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++text;
}
/* FIXME: implement more of the format specifiers */
while (!done) {
switch(*fmt) {
case '*':
suppress = SDL_TRUE;
break;
case 'h':
if ( inttype > DO_SHORT ) {
++inttype;
}
break;
case 'l':
if ( inttype < DO_LONGLONG ) {
++inttype;
}
break;
case 'I':
if ( SDL_strncmp(fmt, "I64", 3) == 0 ) {
fmt += 2;
inttype = DO_LONGLONG;
}
break;
case 'i':
{
int index = 0;
if ( text[index] == '-' ) {
++index;
}
if ( text[index] == '0' ) {
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if ( SDL_tolower((unsigned char) text[index+1]) == 'x' ) {
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radix = 16;
} else {
radix = 8;
}
}
}
/* Fall through to %d handling */
case 'd':
#ifdef SDL_HAS_64BIT_TYPE
if ( inttype == DO_LONGLONG ) {
Sint64 value;
text += SDL_ScanLongLong(text, radix, &value);
if ( ! suppress ) {
Sint64 *valuep = va_arg(ap, Sint64*);
*valuep = value;
++retval;
}
}
else
#endif /* SDL_HAS_64BIT_TYPE */
{
long value;
text += SDL_ScanLong(text, radix, &value);
if ( ! suppress ) {
switch (inttype) {
case DO_SHORT:
{ short* valuep = va_arg(ap, short*);
*valuep = (short)value;
}
break;
case DO_INT:
{ int* valuep = va_arg(ap, int*);
*valuep = (int)value;
}
break;
case DO_LONG:
{ long* valuep = va_arg(ap, long*);
*valuep = value;
}
break;
case DO_LONGLONG:
/* Handled above */
break;
}
++retval;
}
}
done = SDL_TRUE;
break;
case 'o':
if ( radix == 10 ) {
radix = 8;
}
/* Fall through to unsigned handling */
case 'x':
case 'X':
if ( radix == 10 ) {
radix = 16;
}
/* Fall through to unsigned handling */
case 'u':
#ifdef SDL_HAS_64BIT_TYPE
if ( inttype == DO_LONGLONG ) {
Uint64 value;
text += SDL_ScanUnsignedLongLong(text, radix, &value);
if ( ! suppress ) {
Uint64 *valuep = va_arg(ap, Uint64*);
*valuep = value;
++retval;
}
}
else
#endif /* SDL_HAS_64BIT_TYPE */
{
unsigned long value;
text += SDL_ScanUnsignedLong(text, radix, &value);
if ( ! suppress ) {
switch (inttype) {
case DO_SHORT:
{ short* valuep = va_arg(ap, short*);
*valuep = (short)value;
}
break;
case DO_INT:
{ int* valuep = va_arg(ap, int*);
*valuep = (int)value;
}
break;
case DO_LONG:
{ long* valuep = va_arg(ap, long*);
*valuep = value;
}
break;
case DO_LONGLONG:
/* Handled above */
break;
}
++retval;
}
}
done = SDL_TRUE;
break;
case 'p':
{
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948
uintptr_t value;
text += SDL_ScanUintPtrT(text, 16, &value);
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if ( ! suppress ) {
void** valuep = va_arg(ap, void**);
*valuep = (void*)value;
++retval;
}
}
done = SDL_TRUE;
break;
case 'f':
{
double value;
text += SDL_ScanFloat(text, &value);
if ( ! suppress ) {
float* valuep = va_arg(ap, float*);
*valuep = (float)value;
++retval;
}
}
done = SDL_TRUE;
break;
case 's':
if ( suppress ) {
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while ( !SDL_isspace((unsigned char) *text) ) {
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++text;
if ( count ) {
if ( --count == 0 ) {
break;
}
}
}
} else {
char *valuep = va_arg(ap, char*);
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while ( !SDL_isspace((unsigned char) *text) ) {
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*valuep++ = *text++;
if ( count ) {
if ( --count == 0 ) {
break;
}
}
}
*valuep = '\0';
++retval;
}
done = SDL_TRUE;
break;
default:
done = SDL_TRUE;
break;
}
++fmt;
}
continue;