src/stdlib/SDL_string.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2011 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.
*/
#include "SDL_config.h"

/* This file contains portable string manipulation functions for SDL */

#include "SDL_stdinc.h"


#define SDL_isupperhex(X)   (((X) >= 'A') && ((X) <= 'F'))
#define SDL_islowerhex(X)   (((X) >= 'a') && ((X) <= 'f'))

#define UTF8_IsLeadByte(c) ((c) >= 0xC0 && (c) <= 0xF4)
#define UTF8_IsTrailingByte(c) ((c) >= 0x80 && (c) <= 0xBF)

int 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;
    else
        return 0;
}

#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;
        if (SDL_isdigit((unsigned char) *text)) {
            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) {
        if (negative && value) {
            *valuep = -value;
        } else {
            *valuep = value;
        }
    }
    return (text - textstart);
}
#endif

#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD)
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;
        if (SDL_isdigit((unsigned char) *text)) {
            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

#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;
        if (SDL_isdigit((unsigned char) *text)) {
            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

#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;
        if (SDL_isdigit((unsigned char) *text)) {
            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) {
        if (negative && value) {
            *valuep = -value;
        } else {
            *valuep = value;
        }
    }
    return (text - textstart);
}
#endif

#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOULL)
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;
        if (SDL_isdigit((unsigned char) *text)) {
            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

#if !defined(HAVE_SSCANF) || !defined(HAVE_STRTOD)
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;
        while (SDL_isdigit((unsigned char) *text)) {
            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);
    Uint32 *dstp4;
    Uint8 *dstp1;
    Uint32 value4 = (c | (c << 8) | (c << 16) | (c << 24));
    Uint8 value1 = (Uint8) c;

    dstp4 = (Uint32 *) dst;
    len /= 4;
    while (len--) {
        *dstp4++ = value4;
    }

    dstp1 = (Uint8 *) dstp4;
    switch (left) {
    case 3:
        *dstp1++ = value1;
    case 2:
        *dstp1++ = value1;
    case 1:
        *dstp1++ = value1;
    }

    return dst;
}
#endif

#ifndef SDL_memcpy
void *
SDL_memcpy(void *dst, const void *src, size_t len)
{
    size_t left = (len % 4);
    Uint32 *srcp4, *dstp4;
    Uint8 *srcp1, *dstp1;

    srcp4 = (Uint32 *) src;
    dstp4 = (Uint32 *) dst;
    len /= 4;
    while (len--) {
        *dstp4++ = *srcp4++;
    }

    srcp1 = (Uint8 *) srcp4;
    dstp1 = (Uint8 *) dstp4;
    switch (left) {
    case 3:
        *dstp1++ = *srcp1++;
    case 2:
        *dstp1++ = *srcp1++;
    case 1:
        *dstp1++ = *srcp1++;
    }

    return dst;
}
#endif

#ifndef SDL_memmove
void *
SDL_memmove(void *dst, const void *src, size_t len)
{
    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

#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

#ifndef HAVE_WCSLEN
size_t
SDL_wcslen(const wchar_t * string)
{
    size_t len = 0;
    while (*string++) {
        ++len;
    }
    return len;
}
#endif

#ifndef HAVE_WCSLCPY
size_t
SDL_wcslcpy(wchar_t *dst, const wchar_t *src, size_t maxlen)
{
    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

#ifndef HAVE_WCSLCAT
size_t
SDL_wcslcat(wchar_t *dst, const wchar_t *src, size_t maxlen)
{
    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

#ifndef HAVE_STRLCPY
size_t
SDL_strlcpy(char *dst, const char *src, size_t maxlen)
{
    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

size_t SDL_utf8strlcpy(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;
    char 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;
}

#ifndef HAVE_STRLCAT
size_t
SDL_strlcat(char *dst, const char *src, size_t maxlen)
{
    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

#ifndef HAVE_STRDUP
char *
SDL_strdup(const char *string)
{
    size_t len = SDL_strlen(string) + 1;
    char *newstr = SDL_malloc(len);
    if (newstr) {
        SDL_strlcpy(newstr, string, len);
    }
    return newstr;
}
#endif

#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) {
        *bufp = SDL_toupper((unsigned char) *bufp);
        ++bufp;
    }
    return string;
}
#endif

#ifndef HAVE__STRLWR
char *
SDL_strlwr(char *string)
{
    char *bufp = string;
    while (*bufp) {
        *bufp = SDL_tolower((unsigned char) *bufp);
        ++bufp;
    }
    return string;
}
#endif

#ifndef HAVE_STRCHR
char *
SDL_strchr(const char *string, int c)
{
    while (*string) {
        if (*string == c) {
            return (char *) string;
        }
        ++string;
    }
    return NULL;
}
#endif

#ifndef HAVE_STRRCHR
char *
SDL_strrchr(const char *string, int c)
{
    const char *bufp = string + SDL_strlen(string) - 1;
    while (bufp >= string) {
        if (*bufp == c) {
            return (char *) bufp;
        }
        --bufp;
    }
    return NULL;
}
#endif

#ifndef HAVE_STRSTR
char *
SDL_strstr(const char *haystack, const char *needle)
{
    size_t length = SDL_strlen(needle);
    while (*haystack) {
        if (SDL_strncmp(haystack, needle, length) == 0) {
            return (char *) haystack;
        }
        ++haystack;
    }
    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 == '-') {
        SDL_strrev(string + 1);
    } else {
        SDL_strrev(string);
    }

    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. :) */
    SDL_strrev(string);

    return string;
}
#endif

#ifndef HAVE_STRTOL
long
SDL_strtol(const char *string, char **endp, int base)
{
    size_t len;
    long value;

    if (!base) {
        if ((SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0)) {
            base = 16;
        } else {
            base = 10;
        }
    }

    len = SDL_ScanLong(string, base, &value);
    if (endp) {
        *endp = (char *) string + len;
    }
    return value;
}
#endif

#ifndef HAVE_STRTOUL
unsigned long
SDL_strtoul(const char *string, char **endp, int base)
{
    size_t len;
    unsigned long value;

    if (!base) {
        if ((SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0)) {
            base = 16;
        } else {
            base = 10;
        }
    }

    len = SDL_ScanUnsignedLong(string, base, &value);
    if (endp) {
        *endp = (char *) string + len;
    }
    return value;
}
#endif

#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 == '-') {
        SDL_strrev(string + 1);
    } else {
        SDL_strrev(string);
    }

    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. :) */
    SDL_strrev(string);

    return string;
}
#endif

#ifndef HAVE_STRTOLL
Sint64
SDL_strtoll(const char *string, char **endp, int base)
{
    size_t len;
    Sint64 value;

    if (!base) {
        if ((SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0)) {
            base = 16;
        } else {
            base = 10;
        }
    }

    len = SDL_ScanLongLong(string, base, &value);
    if (endp) {
        *endp = (char *) string + len;
    }
    return value;
}
#endif

#ifndef HAVE_STRTOULL
Uint64
SDL_strtoull(const char *string, char **endp, int base)
{
    size_t len;
    Uint64 value;

    if (!base) {
        if ((SDL_strlen(string) > 2) && (SDL_strncmp(string, "0x", 2) == 0)) {
            base = 16;
        } else {
            base = 10;
        }
    }

    len = SDL_ScanUnsignedLongLong(string, base, &value);
    if (endp) {
        *endp = (char *) string + len;
    }
    return value;
}
#endif

#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

#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

#if !defined(HAVE_STRCASECMP) && !defined(HAVE__STRICMP)
int
SDL_strcasecmp(const char *str1, const char *str2)
{
    char a = 0;
    char b = 0;
    while (*str1 && *str2) {
        a = SDL_tolower((unsigned char) *str1);
        b = SDL_tolower((unsigned char) *str2);
        if (a != b)
            break;
        ++str1;
        ++str2;
    }
    a = SDL_tolower(*str1);
    b = SDL_tolower(*str2);
    return (int) ((unsigned char) a - (unsigned char) b);
}
#endif

#if !defined(HAVE_STRNCASECMP) && !defined(HAVE__STRNICMP)
int
SDL_strncasecmp(const char *str1, const char *str2, size_t maxlen)
{
    char a = 0;
    char b = 0;
    while (*str1 && *str2 && maxlen) {
        a = SDL_tolower((unsigned char) *str1);
        b = SDL_tolower((unsigned char) *str2);
        if (a != b)
            break;
        ++str1;
        ++str2;
        --maxlen;
    }
    a = SDL_tolower((unsigned char) *str1);
    b = SDL_tolower((unsigned char) *str2);
    return (int) ((unsigned char) a - (unsigned char) b);
}
#endif

#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 == ' ') {
            while (SDL_isspace((unsigned char) *text)) {
                ++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;
            }

            while (SDL_isspace((unsigned char) *text)) {
                ++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') {
                            if (SDL_tolower((unsigned char) text[index + 1])
                                == 'x') {
                                radix = 16;
                            } else {
                                radix = 8;
                            }
                        }
                    }
                    /* Fall through to %d handling */
                case 'd':
                    if (inttype == DO_LONGLONG) {
                        Sint64 value;
                        text += SDL_ScanLongLong(text, radix, &value);
                        if (!suppress) {
                            Sint64 *valuep = va_arg(ap, Sint64 *);
                            *valuep = value;
                            ++retval;
                        }
                    } else {
                        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':
                    if (inttype == DO_LONGLONG) {
                        Uint64 value;
                        text += SDL_ScanUnsignedLongLong(text, radix, &value);
                        if (!suppress) {
                            Uint64 *valuep = va_arg(ap, Uint64 *);
                            *valuep = value;
                            ++retval;
                        }
                    } else {
                        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':
                    {
                        uintptr_t value;
                        text += SDL_ScanUintPtrT(text, 16, &value);
                        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) {
                        while (!SDL_isspace((unsigned char) *text)) {
                            ++text;
                            if (count) {
                                if (--count == 0) {
                                    break;
                                }
                            }
                        }
                    } else {
                        char *valuep = va_arg(ap, char *);
                        while (!SDL_isspace((unsigned char) *text)) {
                            *valuep++ = *text++;
                            if (count) {
                                if (--count == 0) {
                                    break;
                                }
                            }
                        }
                        *valuep = '\0';
                        ++retval;
                    }
                    done = SDL_TRUE;
                    break;
                default:
                    done = SDL_TRUE;
                    break;
                }
                ++fmt;
            }
            continue;
        }
        if (*text == *fmt) {
            ++text;
            ++fmt;
            continue;
        }
        /* Text didn't match format specifier */
        break;
    }
    va_end(ap);

    return retval;
}
#endif

#ifndef HAVE_SNPRINTF
int
SDL_snprintf(char *text, size_t maxlen, const char *fmt, ...)
{
    va_list ap;
    int retval;

    va_start(ap, fmt);
    retval = SDL_vsnprintf(text, maxlen, fmt, ap);
    va_end(ap);

    return retval;
}
#endif

#ifndef HAVE_VSNPRINTF
static size_t
SDL_PrintLong(char *text, long value, int radix, size_t maxlen)
{
    char num[130];
    size_t size;

    SDL_ltoa(value, num, radix);
    size = SDL_strlen(num);
    if (size >= maxlen) {
        size = maxlen - 1;
    }
    SDL_strlcpy(text, num, size + 1);

    return size;
}

static size_t
SDL_PrintUnsignedLong(char *text, unsigned long value, int radix,
                      size_t maxlen)
{
    char num[130];
    size_t size;

    SDL_ultoa(value, num, radix);
    size = SDL_strlen(num);
    if (size >= maxlen) {
        size = maxlen - 1;
    }
    SDL_strlcpy(text, num, size + 1);

    return size;
}

static size_t
SDL_PrintLongLong(char *text, Sint64 value, int radix, size_t maxlen)
{
    char num[130];
    size_t size;

    SDL_lltoa(value, num, radix);
    size = SDL_strlen(num);
    if (size >= maxlen) {
        size = maxlen - 1;
    }
    SDL_strlcpy(text, num, size + 1);

    return size;
}

static size_t
SDL_PrintUnsignedLongLong(char *text, Uint64 value, int radix, size_t maxlen)
{
    char num[130];
    size_t size;

    SDL_ulltoa(value, num, radix);
    size = SDL_strlen(num);
    if (size >= maxlen) {
        size = maxlen - 1;
    }
    SDL_strlcpy(text, num, size + 1);

    return size;
}

static size_t
SDL_PrintFloat(char *text, double arg, size_t maxlen)
{
    char *textstart = text;
    if (arg) {
        /* This isn't especially accurate, but hey, it's easy. :) */
        const double precision = 0.00000001;
        size_t len;
        unsigned long value;

        if (arg < 0) {
            *text++ = '-';
            --maxlen;
            arg = -arg;
        }
        value = (unsigned long) arg;
        len = SDL_PrintUnsignedLong(text, value, 10, maxlen);
        text += len;
        maxlen -= len;
        arg -= value;
        if (arg > precision && maxlen) {
            int mult = 10;
            *text++ = '.';
            while ((arg > precision) && maxlen) {
                value = (unsigned long) (arg * mult);
                len = SDL_PrintUnsignedLong(text, value, 10, maxlen);
                text += len;
                maxlen -= len;
                arg -= (double) value / mult;
                mult *= 10;
            }
        }
    } else {
        *text++ = '0';
    }
    return (text - textstart);
}

static size_t
SDL_PrintString(char *text, const char *string, size_t maxlen)
{
    char *textstart = text;
    while (*string && maxlen--) {
        *text++ = *string++;
    }
    return (text - textstart);
}

int
SDL_vsnprintf(char *text, size_t maxlen, const char *fmt, va_list ap)
{
    char *textstart = text;
    if (maxlen <= 0) {
        return 0;
    }
    --maxlen;                   /* For the trailing '\0' */
    while (*fmt && maxlen) {
        if (*fmt == '%') {
            SDL_bool done = SDL_FALSE;
            size_t len = 0;
            SDL_bool do_lowercase = SDL_FALSE;
            int radix = 10;
            enum
            {
                DO_INT,
                DO_LONG,
                DO_LONGLONG
            } inttype = DO_INT;

            ++fmt;
            /* FIXME: implement more of the format specifiers */
            while (*fmt == '.' || (*fmt >= '0' && *fmt <= '9')) {
                ++fmt;
            }
            while (!done) {
                switch (*fmt) {
                case '%':
                    *text = '%';
                    len = 1;
                    done = SDL_TRUE;
                    break;
                case 'c':
                    /* char is promoted to int when passed through (...) */
                    *text = (char) va_arg(ap, int);
                    len = 1;
                    done = SDL_TRUE;
                    break;
                case 'h':
                    /* short is promoted to int when passed through (...) */
                    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':
                case 'd':
                    switch (inttype) {
                    case DO_INT:
                        len =
                            SDL_PrintLong(text,
                                          (long) va_arg(ap, int),
                                          radix, maxlen);
                        break;
                    case DO_LONG:
                        len =
                            SDL_PrintLong(text, va_arg(ap, long),
                                          radix, maxlen);
                        break;
                    case DO_LONGLONG:
                        len =
                            SDL_PrintLongLong(text,
                                              va_arg(ap, Sint64),
                                              radix, maxlen);
                        break;
                    }
                    done = SDL_TRUE;
                    break;
                case 'p':
                case 'x':
                    do_lowercase = SDL_TRUE;
                    /* Fall through to 'X' handling */
                case 'X':
                    if (radix == 10) {
                        radix = 16;
                    }
                    if (*fmt == 'p') {
                        inttype = DO_LONG;
                    }
                    /* Fall through to unsigned handling */
                case 'o':
                    if (radix == 10) {
                        radix = 8;
                    }
                    /* Fall through to unsigned handling */
                case 'u':
                    switch (inttype) {
                    case DO_INT:
                        len = SDL_PrintUnsignedLong(text, (unsigned long)
                                                    va_arg(ap,
                                                           unsigned
                                                           int),
                                                    radix, maxlen);
                        break;
                    case DO_LONG:
                        len =
                            SDL_PrintUnsignedLong(text,
                                                  va_arg(ap,
                                                         unsigned
                                                         long),
                                                  radix, maxlen);
                        break;
                    case DO_LONGLONG:
                        len =
                            SDL_PrintUnsignedLongLong(text,
                                                      va_arg(ap,
                                                             Uint64),
                                                      radix, maxlen);
                        break;
                    }
                    if (do_lowercase) {
                        SDL_strlwr(text);
                    }
                    done = SDL_TRUE;
                    break;
                case 'f':
                    len = SDL_PrintFloat(text, va_arg(ap, double), maxlen);
                    done = SDL_TRUE;
                    break;
                case 's':
                    len = SDL_PrintString(text, va_arg(ap, char *), maxlen);
                    done = SDL_TRUE;
                    break;
                default:
                    done = SDL_TRUE;
                    break;
                }
                ++fmt;
            }
            text += len;
            maxlen -= len;
        } else {
            *text++ = *fmt++;
            --maxlen;
        }
    }
    *text = '\0';

    return (int)(text - textstart);
}
#endif
/* vi: set ts=4 sw=4 expandtab: */