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Copy pathSDL_string.c
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2024 lines (1867 loc) · 56.4 KB
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#if defined(__clang_analyzer__)
#define SDL_DISABLE_ANALYZE_MACROS 1
#endif
#include "../SDL_internal.h"
/* This file contains portable string manipulation functions for SDL */
#include "SDL_stdinc.h"
#include "SDL_vacopy.h"
#if defined(__vita__)
#include <psp2/kernel/clib.h>
#endif
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOL) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD) || !defined(HAVE_STRTOLL) || !defined(HAVE_STRTOULL)
#define SDL_isupperhex(X) (((X) >= 'A') && ((X) <= 'F'))
#define SDL_islowerhex(X) (((X) >= 'a') && ((X) <= 'f'))
#endif
#define UTF8_IsLeadByte(c) ((c) >= 0xC0 && (c) <= 0xF4)
#define UTF8_IsTrailingByte(c) ((c) >= 0x80 && (c) <= 0xBF)
static size_t UTF8_TrailingBytes(unsigned char c)
{
if (c >= 0xC0 && c <= 0xDF) {
return 1;
} else if (c >= 0xE0 && c <= 0xEF) {
return 2;
} else if (c >= 0xF0 && c <= 0xF4) {
return 3;
}
return 0;
}
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOL) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD)
/**
* Parses an unsigned long long and returns the unsigned value and sign bit.
*
* Positive values are clamped to ULLONG_MAX.
* The result `value == 0 && negative` indicates negative overflow
* and might need to be handled differently depending on whether a
* signed or unsigned integer is being parsed.
*/
static size_t SDL_ScanUnsignedLongLongInternal(const char *text, int count, int radix, unsigned long long *valuep, SDL_bool *negativep)
{
const unsigned long long ullong_max = ~0ULL;
const char *text_start = text;
const char *number_start = text_start;
unsigned long long value = 0;
SDL_bool negative = SDL_FALSE;
SDL_bool overflow = SDL_FALSE;
if (radix == 0 || (radix >= 2 && radix <= 36)) {
while (SDL_isspace(*text)) {
++text;
}
if (*text == '-' || *text == '+') {
negative = *text == '-';
++text;
}
if ((radix == 0 || radix == 16) && *text == '0' && (text[1] == 'x' || text[1] == 'X')) {
text += 2;
radix = 16;
} else if (radix == 0 && *text == '0' && (text[1] >= '0' && text[1] <= '9')) {
++text;
radix = 8;
} else if (radix == 0) {
radix = 10;
}
number_start = text;
do {
unsigned long long digit;
if (*text >= '0' && *text <= '9') {
digit = *text - '0';
} else if (radix > 10) {
if (*text >= 'A' && *text < 'A' + (radix - 10)) {
digit = 10 + (*text - 'A');
} else if (*text >= 'a' && *text < 'a' + (radix - 10)) {
digit = 10 + (*text - 'a');
} else {
break;
}
} else {
break;
}
if (value != 0 && radix > ullong_max / value) {
overflow = SDL_TRUE;
} else {
value *= radix;
if (digit > ullong_max - value) {
overflow = SDL_TRUE;
} else {
value += digit;
}
}
++text;
} while (count == 0 || (text - text_start) != count);
}
if (text == number_start) {
if (radix == 16 && text > text_start && (*(text - 1) == 'x' || *(text - 1) == 'X')) {
// the string was "0x"; consume the '0' but not the 'x'
--text;
} else {
// no number was parsed, and thus no characters were consumed
text = text_start;
}
}
if (overflow) {
if (negative) {
value = 0;
} else {
value = ullong_max;
}
} else if (value == 0) {
negative = SDL_FALSE;
}
*valuep = value;
*negativep = negative;
return text - text_start;
}
static size_t SDL_ScanLong(const char *text, int count, int radix, long *valuep)
{
const unsigned long long_max = (~0UL) >> 1;
unsigned long long value;
SDL_bool negative;
size_t len = SDL_ScanUnsignedLongLongInternal(text, count, radix, &value, &negative);
if (negative) {
const unsigned long abs_long_min = long_max + 1;
if (value == 0 || value > abs_long_min) {
value = 0ULL - abs_long_min;
} else {
value = 0ULL - value;
}
} else if (value > long_max) {
value = long_max;
}
*valuep = (long)value;
return len;
}
#endif
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD)
static size_t SDL_ScanUnsignedLong(const char *text, int count, int radix, unsigned long *valuep)
{
const unsigned long ulong_max = ~0UL;
unsigned long long value;
SDL_bool negative;
size_t len = SDL_ScanUnsignedLongLongInternal(text, count, radix, &value, &negative);
if (negative) {
if (value == 0 || value > ulong_max) {
value = ulong_max;
} else if (value == ulong_max) {
value = 1;
} else {
value = 0ULL - value;
}
} else if (value > ulong_max) {
value = ulong_max;
}
*valuep = (unsigned long)value;
return len;
}
#endif
#ifndef HAVE_VSSCANF
static size_t SDL_ScanUintPtrT(const char *text, int radix, uintptr_t *valuep)
{
const uintptr_t uintptr_max = ~(uintptr_t)0;
unsigned long long value;
SDL_bool negative;
size_t len = SDL_ScanUnsignedLongLongInternal(text, 0, 16, &value, &negative);
if (negative) {
if (value == 0 || value > uintptr_max) {
value = uintptr_max;
} else if (value == uintptr_max) {
value = 1;
} else {
value = 0ULL - value;
}
} else if (value > uintptr_max) {
value = uintptr_max;
}
*valuep = (uintptr_t)value;
return len;
}
#endif
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOLL) || !defined(HAVE_STRTOULL)
static size_t SDL_ScanLongLong(const char *text, int count, int radix, Sint64 *valuep)
{
const unsigned long long llong_max = (~0ULL) >> 1;
unsigned long long value;
SDL_bool negative;
size_t len = SDL_ScanUnsignedLongLongInternal(text, count, radix, &value, &negative);
if (negative) {
const unsigned long long abs_llong_min = llong_max + 1;
if (value == 0 || value > abs_llong_min) {
value = 0ULL - abs_llong_min;
} else {
value = 0ULL - value;
}
} else if (value > llong_max) {
value = llong_max;
}
*valuep = value;
return len;
}
#endif
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOULL)
static size_t SDL_ScanUnsignedLongLong(const char *text, int count, int radix, Uint64 *valuep)
{
const unsigned long long ullong_max = ~0ULL;
SDL_bool negative;
size_t len = SDL_ScanUnsignedLongLongInternal(text, count, radix, valuep, &negative);
if (negative) {
if (*valuep == 0) {
*valuep = ullong_max;
} else {
*valuep = 0ULL - *valuep;
}
}
return len;
}
#endif
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOD)
static size_t SDL_ScanFloat(const char *text, double *valuep)
{
const char *text_start = text;
const char *number_start = text_start;
double value = 0.0;
SDL_bool negative = SDL_FALSE;
while (SDL_isspace(*text)) {
++text;
}
if (*text == '-' || *text == '+') {
negative = *text == '-';
++text;
}
number_start = text;
if (SDL_isdigit(*text)) {
value += SDL_strtoull(text, (char **)(&text), 10);
if (*text == '.') {
double denom = 10;
++text;
while (SDL_isdigit(*text)) {
value += (double)(*text - '0') / denom;
denom *= 10;
++text;
}
}
}
if (text == number_start) {
// no number was parsed, and thus no characters were consumed
text = text_start;
} else if (negative) {
value = -value;
}
*valuep = value;
return text - text_start;
}
#endif
void *SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#if defined(HAVE_MEMMOVE)
return memmove(dst, src, len);
#else
char *srcp = (char *)src;
char *dstp = (char *)dst;
if (src < dst) {
srcp += len - 1;
dstp += len - 1;
while (len--) {
*dstp-- = *srcp--;
}
} else {
while (len--) {
*dstp++ = *srcp++;
}
}
return dst;
#endif /* HAVE_MEMMOVE */
}
int SDL_memcmp(const void *s1, const void *s2, size_t len)
{
#if defined(__vita__)
/*
Using memcmp on NULL is UB per POSIX / C99 7.21.1/2.
But, both linux and bsd allow that, with an exception:
zero length strings are always identical, so NULLs are never dereferenced.
sceClibMemcmp on PSVita doesn't allow that, so we check ourselves.
*/
if (len == 0) {
return 0;
}
return sceClibMemcmp(s1, s2, len);
#elif defined(HAVE_MEMCMP)
return memcmp(s1, s2, len);
#else
char *s1p = (char *)s1;
char *s2p = (char *)s2;
while (len--) {
if (*s1p != *s2p) {
return *s1p - *s2p;
}
++s1p;
++s2p;
}
return 0;
#endif /* HAVE_MEMCMP */
}
size_t
SDL_strlen(const char *string)
{
#if defined(HAVE_STRLEN)
return strlen(string);
#else
size_t len = 0;
while (*string++) {
++len;
}
return len;
#endif /* HAVE_STRLEN */
}
size_t
SDL_wcslen(const wchar_t *string)
{
#if defined(HAVE_WCSLEN)
return wcslen(string);
#else
size_t len = 0;
while (*string++) {
++len;
}
return len;
#endif /* HAVE_WCSLEN */
}
size_t
SDL_wcslcpy(SDL_OUT_Z_CAP(maxlen) wchar_t *dst, const wchar_t *src, size_t maxlen)
{
#if defined(HAVE_WCSLCPY)
return wcslcpy(dst, src, maxlen);
#else
size_t srclen = SDL_wcslen(src);
if (maxlen > 0) {
size_t len = SDL_min(srclen, maxlen - 1);
SDL_memcpy(dst, src, len * sizeof(wchar_t));
dst[len] = '\0';
}
return srclen;
#endif /* HAVE_WCSLCPY */
}
size_t
SDL_wcslcat(SDL_INOUT_Z_CAP(maxlen) wchar_t *dst, const wchar_t *src, size_t maxlen)
{
#if defined(HAVE_WCSLCAT)
return wcslcat(dst, src, maxlen);
#else
size_t dstlen = SDL_wcslen(dst);
size_t srclen = SDL_wcslen(src);
if (dstlen < maxlen) {
SDL_wcslcpy(dst + dstlen, src, maxlen - dstlen);
}
return dstlen + srclen;
#endif /* HAVE_WCSLCAT */
}
wchar_t *SDL_wcsdup(const wchar_t *string)
{
size_t len = ((SDL_wcslen(string) + 1) * sizeof(wchar_t));
wchar_t *newstr = (wchar_t *)SDL_malloc(len);
if (newstr) {
SDL_memcpy(newstr, string, len);
}
return newstr;
}
wchar_t *SDL_wcsstr(const wchar_t *haystack, const wchar_t *needle)
{
#if defined(HAVE_WCSSTR)
return SDL_const_cast(wchar_t *, wcsstr(haystack, needle));
#else
size_t length = SDL_wcslen(needle);
while (*haystack) {
if (SDL_wcsncmp(haystack, needle, length) == 0) {
return (wchar_t *)haystack;
}
++haystack;
}
return NULL;
#endif /* HAVE_WCSSTR */
}
int SDL_wcscmp(const wchar_t *str1, const wchar_t *str2)
{
#if defined(HAVE_WCSCMP)
return wcscmp(str1, str2);
#else
while (*str1 && *str2) {
if (*str1 != *str2) {
break;
}
++str1;
++str2;
}
return *str1 - *str2;
#endif /* HAVE_WCSCMP */
}
int SDL_wcsncmp(const wchar_t *str1, const wchar_t *str2, size_t maxlen)
{
#if defined(HAVE_WCSNCMP)
return wcsncmp(str1, str2, maxlen);
#else
while (*str1 && *str2 && maxlen) {
if (*str1 != *str2) {
break;
}
++str1;
++str2;
--maxlen;
}
if (!maxlen) {
return 0;
}
return *str1 - *str2;
#endif /* HAVE_WCSNCMP */
}
int SDL_wcscasecmp(const wchar_t *str1, const wchar_t *str2)
{
#if defined(HAVE_WCSCASECMP)
return wcscasecmp(str1, str2);
#elif defined(HAVE__WCSICMP)
return _wcsicmp(str1, str2);
#else
wchar_t a = 0;
wchar_t b = 0;
while (*str1 && *str2) {
/* FIXME: This doesn't actually support wide characters */
if (*str1 >= 0x80 || *str2 >= 0x80) {
a = *str1;
b = *str2;
} else {
a = SDL_toupper((unsigned char)*str1);
b = SDL_toupper((unsigned char)*str2);
}
if (a != b) {
break;
}
++str1;
++str2;
}
/* FIXME: This doesn't actually support wide characters */
if (*str1 >= 0x80 || *str2 >= 0x80) {
a = *str1;
b = *str2;
} else {
a = SDL_toupper((unsigned char)*str1);
b = SDL_toupper((unsigned char)*str2);
}
return (int)((unsigned int)a - (unsigned int)b);
#endif /* HAVE__WCSICMP */
}
int SDL_wcsncasecmp(const wchar_t *str1, const wchar_t *str2, size_t maxlen)
{
#if defined(HAVE_WCSNCASECMP)
return wcsncasecmp(str1, str2, maxlen);
#elif defined(HAVE__WCSNICMP)
return _wcsnicmp(str1, str2, maxlen);
#else
wchar_t a = 0;
wchar_t b = 0;
while (*str1 && *str2 && maxlen) {
/* FIXME: This doesn't actually support wide characters */
if (*str1 >= 0x80 || *str2 >= 0x80) {
a = *str1;
b = *str2;
} else {
a = SDL_toupper((unsigned char)*str1);
b = SDL_toupper((unsigned char)*str2);
}
if (a != b) {
break;
}
++str1;
++str2;
--maxlen;
}
if (maxlen == 0) {
return 0;
} else {
/* FIXME: This doesn't actually support wide characters */
if (*str1 >= 0x80 || *str2 >= 0x80) {
a = *str1;
b = *str2;
} else {
a = SDL_toupper((unsigned char)*str1);
b = SDL_toupper((unsigned char)*str2);
}
return (int)((unsigned int)a - (unsigned int)b);
}
#endif /* HAVE__WCSNICMP */
}
size_t
SDL_strlcpy(SDL_OUT_Z_CAP(maxlen) char *dst, const char *src, size_t maxlen)
{
#if defined(HAVE_STRLCPY)
return strlcpy(dst, src, maxlen);
#else
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';
}
return srclen;
#endif /* HAVE_STRLCPY */
}
size_t
SDL_utf8strlcpy(SDL_OUT_Z_CAP(dst_bytes) char *dst, const char *src, size_t dst_bytes)
{
size_t src_bytes = SDL_strlen(src);
size_t bytes = SDL_min(src_bytes, dst_bytes - 1);
size_t i = 0;
size_t trailing_bytes = 0;
if (bytes) {
unsigned char c = (unsigned char)src[bytes - 1];
if (UTF8_IsLeadByte(c)) {
--bytes;
} else if (UTF8_IsTrailingByte(c)) {
for (i = bytes - 1; i != 0; --i) {
c = (unsigned char)src[i];
trailing_bytes = UTF8_TrailingBytes(c);
if (trailing_bytes) {
if (bytes - i != trailing_bytes + 1) {
bytes = i;
}
break;
}
}
}
SDL_memcpy(dst, src, bytes);
}
dst[bytes] = '\0';
return bytes;
}
size_t
SDL_utf8strlen(const char *str)
{
size_t retval = 0;
const char *p = str;
unsigned char ch;
while ((ch = *(p++)) != 0) {
/* if top two bits are 1 and 0, it's a continuation byte. */
if ((ch & 0xc0) != 0x80) {
retval++;
}
}
return retval;
}
size_t
SDL_utf8strnlen(const char *str, size_t bytes)
{
size_t retval = 0;
const char *p = str;
unsigned char ch;
while ((ch = *(p++)) != 0 && bytes-- > 0) {
/* if top two bits are 1 and 0, it's a continuation byte. */
if ((ch & 0xc0) != 0x80) {
retval++;
}
}
return retval;
}
size_t
SDL_strlcat(SDL_INOUT_Z_CAP(maxlen) char *dst, const char *src, size_t maxlen)
{
#if defined(HAVE_STRLCAT)
return strlcat(dst, src, maxlen);
#else
size_t dstlen = SDL_strlen(dst);
size_t srclen = SDL_strlen(src);
if (dstlen < maxlen) {
SDL_strlcpy(dst + dstlen, src, maxlen - dstlen);
}
return dstlen + srclen;
#endif /* HAVE_STRLCAT */
}
char *SDL_strdup(const char *string)
{
size_t len = SDL_strlen(string) + 1;
char *newstr = (char *)SDL_malloc(len);
if (newstr) {
SDL_memcpy(newstr, string, len);
}
return newstr;
}
char *SDL_strrev(char *string)
{
#if defined(HAVE__STRREV)
return _strrev(string);
#else
size_t len = SDL_strlen(string);
char *a = &string[0];
char *b = &string[len - 1];
len /= 2;
while (len--) {
char c = *a; /* NOLINT(clang-analyzer-core.uninitialized.Assign) */
*a++ = *b;
*b-- = c;
}
return string;
#endif /* HAVE__STRREV */
}
char *SDL_strupr(char *string)
{
#if defined(HAVE__STRUPR)
return _strupr(string);
#else
char *bufp = string;
while (*bufp) {
*bufp = SDL_toupper((unsigned char)*bufp);
++bufp;
}
return string;
#endif /* HAVE__STRUPR */
}
char *SDL_strlwr(char *string)
{
#if defined(HAVE__STRLWR)
return _strlwr(string);
#else
char *bufp = string;
while (*bufp) {
*bufp = SDL_tolower((unsigned char)*bufp);
++bufp;
}
return string;
#endif /* HAVE__STRLWR */
}
char *SDL_strchr(const char *string, int c)
{
#ifdef HAVE_STRCHR
return SDL_const_cast(char *, strchr(string, c));
#elif defined(HAVE_INDEX)
return SDL_const_cast(char *, index(string, c));
#else
while (*string) {
if (*string == c) {
return (char *)string;
}
++string;
}
if (c == '\0') {
return (char *)string;
}
return NULL;
#endif /* HAVE_STRCHR */
}
char *SDL_strrchr(const char *string, int c)
{
#ifdef HAVE_STRRCHR
return SDL_const_cast(char *, strrchr(string, c));
#elif defined(HAVE_RINDEX)
return SDL_const_cast(char *, rindex(string, c));
#else
const char *bufp = string + SDL_strlen(string);
while (bufp >= string) {
if (*bufp == c) {
return (char *)bufp;
}
--bufp;
}
return NULL;
#endif /* HAVE_STRRCHR */
}
char *SDL_strstr(const char *haystack, const char *needle)
{
#if defined(HAVE_STRSTR)
return SDL_const_cast(char *, strstr(haystack, needle));
#else
size_t length = SDL_strlen(needle);
while (*haystack) {
if (SDL_strncmp(haystack, needle, length) == 0) {
return (char *)haystack;
}
++haystack;
}
return NULL;
#endif /* HAVE_STRSTR */
}
char *SDL_strcasestr(const char *haystack, const char *needle)
{
#if defined(HAVE_STRCASESTR)
return SDL_const_cast(char *, strcasestr(haystack, needle));
#else
size_t length = SDL_strlen(needle);
while (*haystack) {
if (SDL_strncasecmp(haystack, needle, length) == 0) {
return (char *)haystack;
}
++haystack;
}
return NULL;
#endif /* HAVE_STRCASESTR */
}
#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 */
char *SDL_uitoa(unsigned int value, char *string, int radix)
{
return SDL_ultoa((unsigned long)value, string, radix);
}
char *SDL_itoa(int value, char *string, int radix)
{
#ifdef HAVE_ITOA
return itoa(value, string, radix);
#else
return SDL_ltoa((long)value, string, radix);
#endif /* HAVE_ITOA */
}
char *SDL_ltoa(long value, char *string, int radix)
{
#if defined(HAVE__LTOA)
return _ltoa(value, string, radix);
#else
char *bufp = string;
if (value < 0) {
*bufp++ = '-';
SDL_ultoa(-value, bufp, radix);
} else {
SDL_ultoa(value, bufp, radix);
}
return string;
#endif /* HAVE__LTOA */
}
char *SDL_ultoa(unsigned long value, char *string, int radix)
{
#if defined(HAVE__ULTOA)
return _ultoa(value, string, radix);
#else
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. :) */
SDL_strrev(string);
return string;
#endif /* HAVE__ULTOA */
}
char *SDL_lltoa(Sint64 value, char *string, int radix)
{
#if defined(HAVE__I64TOA)
return _i64toa(value, string, radix);
#else
char *bufp = string;
if (value < 0) {
*bufp++ = '-';
SDL_ulltoa(-value, bufp, radix);
} else {
SDL_ulltoa(value, bufp, radix);
}
return string;
#endif /* HAVE__I64TOA */
}
char *SDL_ulltoa(Uint64 value, char *string, int radix)
{
#if defined(HAVE__UI64TOA)
return _ui64toa(value, string, radix);
#else
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. :) */
SDL_strrev(string);
return string;
#endif /* HAVE__UI64TOA */
}
int SDL_atoi(const char *string)
{
#ifdef HAVE_ATOI
return atoi(string);
#else
return SDL_strtol(string, NULL, 10);
#endif /* HAVE_ATOI */
}
double SDL_atof(const char *string)
{
#ifdef HAVE_ATOF
return atof(string);
#else
return SDL_strtod(string, NULL);
#endif /* HAVE_ATOF */
}
long SDL_strtol(const char *string, char **endp, int base)
{
#if defined(HAVE_STRTOL)
return strtol(string, endp, base);
#else
long value = 0;
size_t len = SDL_ScanLong(string, 0, base, &value);
if (endp) {
*endp = (char *)string + len;
}
return value;
#endif /* HAVE_STRTOL */
}
unsigned long
SDL_strtoul(const char *string, char **endp, int base)
{
#if defined(HAVE_STRTOUL)
return strtoul(string, endp, base);
#else
unsigned long value = 0;
size_t len = SDL_ScanUnsignedLong(string, 0, base, &value);
if (endp) {
*endp = (char *)string + len;
}
return value;
#endif /* HAVE_STRTOUL */
}
Sint64 SDL_strtoll(const char *string, char **endp, int base)
{
#if defined(HAVE_STRTOLL)
return strtoll(string, endp, base);
#else
long long value = 0;
size_t len = SDL_ScanLongLong(string, 0, base, &value);
if (endp) {
*endp = (char *)string + len;
}
return value;
#endif /* HAVE_STRTOLL */
}
Uint64 SDL_strtoull(const char *string, char **endp, int base)
{
#if defined(HAVE_STRTOULL)
return strtoull(string, endp, base);
#else
unsigned long long value = 0;
size_t len = SDL_ScanUnsignedLongLong(string, 0, base, &value);
if (endp) {
*endp = (char *)string + len;
}
return value;
#endif /* HAVE_STRTOULL */
}
double
SDL_strtod(const char *string, char **endp)
{
#if defined(HAVE_STRTOD)
return strtod(string, endp);
#else
size_t len;
double value = 0.0;
len = SDL_ScanFloat(string, &value);
if (endp) {
*endp = (char *)string + len;
}
return value;
#endif /* HAVE_STRTOD */
}
int SDL_strcmp(const char *str1, const char *str2)
{
#if defined(HAVE_STRCMP)
return strcmp(str1, str2);
#else
int result;
while (1) {
result = ((unsigned char)*str1 - (unsigned char)*str2);
if (result != 0 || (*str1 == '\0' /* && *str2 == '\0'*/)) {
break;
}
++str1;
++str2;
}
return result;
#endif /* HAVE_STRCMP */
}
int SDL_strncmp(const char *str1, const char *str2, size_t maxlen)
{
#if defined(HAVE_STRNCMP)
return strncmp(str1, str2, maxlen);
#else
int result;
while (maxlen) {
result = (int)(unsigned char)*str1 - (unsigned char)*str2;
if (result != 0 || *str1 == '\0' /* && *str2 == '\0'*/) {
break;
}
++str1;
++str2;
--maxlen;
}