X-Git-Url: https://git.eyrie.org/?a=blobdiff_plain;f=portable%2Fsnprintf.c;fp=portable%2Fsnprintf.c;h=0000000000000000000000000000000000000000;hb=399c639c92b4c5f125ba09f47400f8ae39061a3c;hp=a22e4e47d24757d9443d850a4057699db588c720;hpb=743bbb08453a40326e0a2f737562d66a07cbaf66;p=kerberos%2Fkrb5-strength.git diff --git a/portable/snprintf.c b/portable/snprintf.c deleted file mode 100644 index a22e4e4..0000000 --- a/portable/snprintf.c +++ /dev/null @@ -1,992 +0,0 @@ -/* - * Replacement for a missing snprintf or vsnprintf. - * - * The following implementation of snprintf was taken mostly verbatim from - * ; it is the version of snprintf - * used in Mutt. A possibly newer version is used in wget, found at - * . - * - * Please do not reformat or otherwise change this file more than necessary so - * that later merges with the original source are easy. Bug fixes and - * improvements should be sent back to the original author. - * - * The canonical version of this file is maintained in the rra-c-util package, - * which can be found at . - */ - -/* - * If we're running the test suite, rename snprintf and vsnprintf to avoid - * conflicts with the system version. - */ -#if TESTING -# undef snprintf -# undef vsnprintf -# define snprintf test_snprintf -# define vsnprintf test_vsnprintf -#endif - -/* - * __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7 - * could you use the __format__ form of the attributes, which is what we use - * (to avoid confusion with other macros). - */ -#ifndef __attribute__ -# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) -# define __attribute__(spec) /* empty */ -# endif -#endif - -/* - * Older Clang doesn't support __attribute__((fallthrough)) properly and - * complains about the empty statement that it is decorating. Suppress that - * warning. Also suppress warnings about unknown attributes to handle older - * Clang versions. - */ -#if !defined(__attribute__) && (defined(__llvm__) || defined(__clang__)) -# pragma GCC diagnostic ignored "-Wattributes" -# pragma GCC diagnostic ignored "-Wmissing-declarations" -#endif - -/* Specific to rra-c-util, but only when debugging is enabled. */ -#ifdef DEBUG_SNPRINTF -# include -#endif - -/* - * Copyright Patrick Powell 1995 - * This code is based on code written by Patrick Powell (papowell@astart.com) - * It may be used for any purpose as long as this notice remains intact - * on all source code distributions - * - * There is no SPDX-License-Identifier registered for this license. - */ - -/************************************************************** - * Original: - * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 - * A bombproof version of doprnt (dopr) included. - * Sigh. This sort of thing is always nasty do deal with. Note that - * the version here does not include floating point... - * - * snprintf() is used instead of sprintf() as it does limit checks - * for string length. This covers a nasty loophole. - * - * The other functions are there to prevent NULL pointers from - * causing nast effects. - * - * More Recently: - * Brandon Long 9/15/96 for mutt 0.43 - * This was ugly. It is still ugly. I opted out of floating point - * numbers, but the formatter understands just about everything - * from the normal C string format, at least as far as I can tell from - * the Solaris 2.5 printf(3S) man page. - * - * Brandon Long 10/22/97 for mutt 0.87.1 - * Ok, added some minimal floating point support, which means this - * probably requires libm on most operating systems. Don't yet - * support the exponent (e,E) and sigfig (g,G). Also, fmtint() - * was pretty badly broken, it just wasn't being exercised in ways - * which showed it, so that's been fixed. Also, formatted the code - * to mutt conventions, and removed dead code left over from the - * original. Also, there is now a builtin-test, just compile with: - * gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm - * and run snprintf for results. - * - * Thomas Roessler 01/27/98 for mutt 0.89i - * The PGP code was using unsigned hexadecimal formats. - * Unfortunately, unsigned formats simply didn't work. - * - * Michael Elkins 03/05/98 for mutt 0.90.8 - * The original code assumed that both snprintf() and vsnprintf() were - * missing. Some systems only have snprintf() but not vsnprintf(), so - * the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF. - * - * Andrew Tridgell (tridge@samba.org) Oct 1998 - * fixed handling of %.0f - * added test for HAVE_LONG_DOUBLE - * - * Russ Allbery 2000-08-26 - * fixed return value to comply with C99 - * fixed handling of snprintf(NULL, ...) - * added explicit casts for double to long long int conversion - * fixed various warnings with GCC 7 - * fixed various warnings with Clang - * - * Hrvoje Niksic 2000-11-04 - * include instead of "config.h". - * moved TEST_SNPRINTF stuff out of HAVE_SNPRINTF ifdef. - * include for NULL. - * added support and test cases for long long. - * don't declare argument types to (v)snprintf if stdarg is not used. - * use int instead of short int as 2nd arg to va_arg. - * - * alexk (INN) 2002-08-21 - * use LLONG in fmtfp to handle more characters during floating - * point conversion. - * - * herb (Samba) 2002-12-19 - * actually print args for %g and %e - * - * Hrvoje Niksic 2005-04-15 - * use the PARAMS macro to handle prototypes. - * write function definitions in the ansi2knr-friendly way. - * if string precision is specified, don't read VALUE past it. - * fix bug in fmtfp that caused 0.01 to be printed as 0.1. - * don't include because none of it is used. - * interpret precision as number of significant digits with %g - * omit trailing decimal zeros with %g - * - **************************************************************/ - -#include - -#include -#include -#include - -#ifndef NULL -# define NULL 0 -#endif - -/* varargs declarations: */ - -#include - -/* Assume all compilers support long double, per Autoconf documentation. */ -#define LDOUBLE long double - -#ifdef HAVE_LONG_LONG_INT -# define LLONG long long -#else -# define LLONG long -#endif - -int snprintf (char *str, size_t count, const char *fmt, ...); -int vsnprintf (char *str, size_t count, const char *fmt, va_list arg); - -static int dopr (char *buffer, size_t maxlen, const char *format, - va_list args); -static int fmtstr (char *buffer, size_t *currlen, size_t maxlen, - const char *value, int flags, int min, int max); -static int fmtint (char *buffer, size_t *currlen, size_t maxlen, - LLONG value, int base, int min, int max, int flags); -static int fmtfp (char *buffer, size_t *currlen, size_t maxlen, - LDOUBLE fvalue, int min, int max, int flags); -static int dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c ); - -/* - * dopr(): poor man's version of doprintf - */ - -/* format read states */ -#define DP_S_DEFAULT 0 -#define DP_S_FLAGS 1 -#define DP_S_MIN 2 -#define DP_S_DOT 3 -#define DP_S_MAX 4 -#define DP_S_MOD 5 -#define DP_S_MOD_L 6 -#define DP_S_CONV 7 -#define DP_S_DONE 8 - -/* format flags - Bits */ -#define DP_F_MINUS (1 << 0) -#define DP_F_PLUS (1 << 1) -#define DP_F_SPACE (1 << 2) -#define DP_F_NUM (1 << 3) -#define DP_F_ZERO (1 << 4) -#define DP_F_UP (1 << 5) -#define DP_F_UNSIGNED (1 << 6) -#define DP_F_FP_G (1 << 7) - -/* Conversion Flags */ -#define DP_C_SHORT 1 -#define DP_C_LONG 2 -#define DP_C_LLONG 3 -#define DP_C_LDOUBLE 4 - -#define char_to_int(p) (p - '0') -#define MAX(p,q) ((p >= q) ? p : q) -#define MIN(p,q) ((p <= q) ? p : q) - -static int dopr (char *buffer, size_t maxlen, const char *format, va_list args) -{ - char ch; - LLONG value; - LDOUBLE fvalue; - char *strvalue; - int min; - int max; - unsigned int state; - int flags; - int cflags; - int total; - size_t currlen; - - state = DP_S_DEFAULT; - currlen = flags = cflags = min = 0; - max = -1; - ch = *format++; - total = 0; - - while (state != DP_S_DONE) - { - if (ch == '\0') - state = DP_S_DONE; - - switch(state) - { - case DP_S_DEFAULT: - if (ch == '%') - state = DP_S_FLAGS; - else - total += dopr_outch (buffer, &currlen, maxlen, ch); - ch = *format++; - break; - case DP_S_FLAGS: - switch (ch) - { - case '-': - flags |= DP_F_MINUS; - ch = *format++; - break; - case '+': - flags |= DP_F_PLUS; - ch = *format++; - break; - case ' ': - flags |= DP_F_SPACE; - ch = *format++; - break; - case '#': - flags |= DP_F_NUM; - ch = *format++; - break; - case '0': - flags |= DP_F_ZERO; - ch = *format++; - break; - default: - state = DP_S_MIN; - break; - } - break; - case DP_S_MIN: - if ('0' <= ch && ch <= '9') - { - min = 10*min + char_to_int (ch); - ch = *format++; - } - else if (ch == '*') - { - min = va_arg (args, int); - ch = *format++; - state = DP_S_DOT; - } - else - state = DP_S_DOT; - break; - case DP_S_DOT: - if (ch == '.') - { - state = DP_S_MAX; - ch = *format++; - } - else - state = DP_S_MOD; - break; - case DP_S_MAX: - if ('0' <= ch && ch <= '9') - { - if (max < 0) - max = 0; - max = 10*max + char_to_int (ch); - ch = *format++; - } - else if (ch == '*') - { - max = va_arg (args, int); - ch = *format++; - state = DP_S_MOD; - } - else - state = DP_S_MOD; - break; - case DP_S_MOD: - switch (ch) - { - case 'h': - cflags = DP_C_SHORT; - ch = *format++; - break; - case 'l': - cflags = DP_C_LONG; - ch = *format++; - break; - case 'L': - cflags = DP_C_LDOUBLE; - ch = *format++; - break; - default: - break; - } - if (cflags != DP_C_LONG) - state = DP_S_CONV; - else - state = DP_S_MOD_L; - break; - case DP_S_MOD_L: - switch (ch) - { - case 'l': - cflags = DP_C_LLONG; - ch = *format++; - break; - default: - break; - } - state = DP_S_CONV; - break; - case DP_S_CONV: - switch (ch) - { - case 'd': - case 'i': - if (cflags == DP_C_SHORT) - value = (short int) va_arg (args, int); - else if (cflags == DP_C_LONG) - value = va_arg (args, long int); - else if (cflags == DP_C_LLONG) - value = va_arg (args, LLONG); - else - value = va_arg (args, int); - total += fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags); - break; - case 'o': - flags |= DP_F_UNSIGNED; - if (cflags == DP_C_SHORT) - value = (unsigned short int) va_arg (args, unsigned int); - else if (cflags == DP_C_LONG) - value = va_arg (args, unsigned long int); - else if (cflags == DP_C_LLONG) - value = va_arg (args, unsigned LLONG); - else - value = va_arg (args, unsigned int); - total += fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags); - break; - case 'u': - flags |= DP_F_UNSIGNED; - if (cflags == DP_C_SHORT) - value = (unsigned short int) va_arg (args, unsigned int); - else if (cflags == DP_C_LONG) - value = va_arg (args, unsigned long int); - else if (cflags == DP_C_LLONG) - value = va_arg (args, unsigned LLONG); - else - value = va_arg (args, unsigned int); - total += fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags); - break; - case 'X': - flags |= DP_F_UP; - __attribute__((fallthrough)); - /* fall through */ - case 'x': - flags |= DP_F_UNSIGNED; - if (cflags == DP_C_SHORT) - value = (unsigned short int) va_arg (args, unsigned int); - else if (cflags == DP_C_LONG) - value = va_arg (args, unsigned long int); - else if (cflags == DP_C_LLONG) - value = va_arg (args, unsigned LLONG); - else - value = va_arg (args, unsigned int); - total += fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags); - break; - case 'f': - if (cflags == DP_C_LDOUBLE) - fvalue = va_arg (args, LDOUBLE); - else - fvalue = (LDOUBLE) va_arg (args, double); - total += fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); - break; - case 'E': - flags |= DP_F_UP; - __attribute__((fallthrough)); - /* fall through */ - case 'e': - if (cflags == DP_C_LDOUBLE) - fvalue = va_arg (args, LDOUBLE); - else - fvalue = (LDOUBLE) va_arg (args, double); - total += fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); - break; - case 'G': - flags |= DP_F_UP; - __attribute__((fallthrough)); - /* fall through */ - case 'g': - flags |= DP_F_FP_G; - if (cflags == DP_C_LDOUBLE) - fvalue = va_arg (args, LDOUBLE); - else - fvalue = (LDOUBLE) va_arg (args, double); - if (max == 0) - /* C99 says: if precision [for %g] is zero, it is taken as one */ - max = 1; - total += fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags); - break; - case 'c': - total += dopr_outch (buffer, &currlen, maxlen, - (char) va_arg (args, int)); - break; - case 's': - strvalue = va_arg (args, char *); - total += fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max); - break; - case 'p': - strvalue = va_arg (args, void *); - total += fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, - max, flags); - break; - case 'n': - if (cflags == DP_C_SHORT) - { - short int *num; - num = va_arg (args, short int *); - *num = (short) currlen; - } - else if (cflags == DP_C_LONG) - { - long int *num; - num = va_arg (args, long int *); - *num = currlen; - } - else if (cflags == DP_C_LLONG) - { - LLONG *num; - num = va_arg (args, LLONG *); - *num = currlen; - } - else - { - int *num; - num = va_arg (args, int *); - *num = (int) currlen; - } - break; - case '%': - total += dopr_outch (buffer, &currlen, maxlen, ch); - break; - case 'w': - /* not supported yet, treat as next char */ - format++; - break; - default: - /* Unknown, skip */ - break; - } - ch = *format++; - state = DP_S_DEFAULT; - flags = cflags = min = 0; - max = -1; - break; - case DP_S_DONE: - break; - default: - /* hmm? */ - break; /* some picky compilers need this */ - } - } - if (buffer != NULL) - { - if (currlen < maxlen - 1) - buffer[currlen] = '\0'; - else - buffer[maxlen - 1] = '\0'; - } - return total; -} - -static int fmtstr (char *buffer, size_t *currlen, size_t maxlen, - const char *value, int flags, int min, int max) -{ - int padlen, strln; /* amount to pad */ - int cnt = 0; - int total = 0; - - if (value == 0) - { - value = "(null)"; - } - - if (max < 0) - strln = (int) strlen (value); - else - /* When precision is specified, don't read VALUE past precision. */ - /*strln = strnlen (value, max);*/ - for (strln = 0; strln < max && value[strln]; ++strln); - padlen = min - strln; - if (padlen < 0) - padlen = 0; - if (flags & DP_F_MINUS) - padlen = -padlen; /* Left Justify */ - - while (padlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, ' '); - --padlen; - } - while (*value && ((max < 0) || (cnt < max))) - { - total += dopr_outch (buffer, currlen, maxlen, *value++); - ++cnt; - } - while (padlen < 0) - { - total += dopr_outch (buffer, currlen, maxlen, ' '); - ++padlen; - } - return total; -} - -/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */ - -static int fmtint (char *buffer, size_t *currlen, size_t maxlen, - LLONG value, int base, int min, int max, int flags) -{ - char signvalue = 0; - unsigned LLONG uvalue; - char convert[24]; - unsigned int place = 0; - int spadlen = 0; /* amount to space pad */ - int zpadlen = 0; /* amount to zero pad */ - const char *digits; - int total = 0; - - if (max < 0) - max = 0; - - uvalue = value; - - if(!(flags & DP_F_UNSIGNED)) - { - if( value < 0 ) { - signvalue = '-'; - uvalue = -value; - } - else - if (flags & DP_F_PLUS) /* Do a sign (+/i) */ - signvalue = '+'; - else - if (flags & DP_F_SPACE) - signvalue = ' '; - } - - if (flags & DP_F_UP) - /* Should characters be upper case? */ - digits = "0123456789ABCDEF"; - else - digits = "0123456789abcdef"; - - do { - convert[place++] = digits[uvalue % (unsigned)base]; - uvalue = (uvalue / (unsigned)base ); - } while(uvalue && (place < sizeof (convert))); - if (place == sizeof (convert)) place--; - convert[place] = 0; - - zpadlen = max - place; - spadlen = min - MAX ((unsigned int)max, place) - (signvalue ? 1 : 0); - if (zpadlen < 0) zpadlen = 0; - if (spadlen < 0) spadlen = 0; - if (flags & DP_F_ZERO) - { - zpadlen = MAX(zpadlen, spadlen); - spadlen = 0; - } - if (flags & DP_F_MINUS) - spadlen = -spadlen; /* Left Justifty */ - -#ifdef DEBUG_SNPRINTF - debug ("zpad: %d, spad: %d, min: %d, max: %d, place: %u\n", - zpadlen, spadlen, min, max, place); -#endif - - /* Spaces */ - while (spadlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, ' '); - --spadlen; - } - - /* Sign */ - if (signvalue) - total += dopr_outch (buffer, currlen, maxlen, signvalue); - - /* Zeros */ - if (zpadlen > 0) - { - while (zpadlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, '0'); - --zpadlen; - } - } - - /* Digits */ - while (place > 0) - total += dopr_outch (buffer, currlen, maxlen, convert[--place]); - - /* Left Justified spaces */ - while (spadlen < 0) { - total += dopr_outch (buffer, currlen, maxlen, ' '); - ++spadlen; - } - - return total; -} - -static LDOUBLE abs_val (LDOUBLE value) -{ - LDOUBLE result = value; - - if (value < 0) - result = -value; - - return result; -} - -static LLONG pow10_int (unsigned int exp) -{ - LDOUBLE result = 1; - - while (exp) - { - result *= 10; - exp--; - } - - return (LLONG) result; -} - -static LLONG round_int (LDOUBLE value) -{ - LLONG intpart; - - intpart = (LLONG) value; - value = value - intpart; - if (value >= (LDOUBLE) 0.5) - intpart++; - - return intpart; -} - -/* - * GCC 7.1 issues this warning at the point of the function definition header - * (not in any actual code), and I can't figure out what's triggering it since - * the comparison form doesn't appear anywhere in this code. Since this is - * rarely-used portability code, suppress the warning. - */ -#pragma GCC diagnostic ignored "-Wstrict-overflow" - -static int fmtfp (char *buffer, size_t *currlen, size_t maxlen, - LDOUBLE fvalue, int min, int max, int flags) -{ - char signvalue = 0; - LDOUBLE ufvalue; - char iconvert[24]; - char fconvert[24]; - size_t iplace = 0; - size_t fplace = 0; - long padlen = 0; /* amount to pad */ - long zpadlen = 0; - int total = 0; - LLONG intpart; - LLONG fracpart; - LLONG mask10; - int leadingfrac0s = 0; /* zeroes at the start of fractional part */ - int omitzeros = 0; - size_t omitcount = 0; - - /* - * AIX manpage says the default is 0, but Solaris says the default - * is 6, and sprintf on AIX defaults to 6 - */ - if (max < 0) - max = 6; - - ufvalue = abs_val (fvalue); - - if (fvalue < 0) - signvalue = '-'; - else - if (flags & DP_F_PLUS) /* Do a sign (+/i) */ - signvalue = '+'; - else - if (flags & DP_F_SPACE) - signvalue = ' '; - -#if 0 - if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */ -#endif - - intpart = (LLONG) ufvalue; - - /* With %g precision is the number of significant digits, which - includes the digits in intpart. */ - if (flags & DP_F_FP_G) - { - if (intpart != 0) - { - /* For each digit of INTPART, print one less fractional digit. */ - LLONG temp; - for (temp = intpart; temp != 0; temp /= 10) - --max; - if (max < 0) - max = 0; - } - else - { - /* For each leading 0 in fractional part, print one more - fractional digit. */ - LDOUBLE temp; - if (ufvalue > 0) - for (temp = ufvalue; temp < (LDOUBLE) 0.1; temp *= 10) - ++max; - } - } - - /* C99: trailing zeros are removed from the fractional portion of the - result unless the # flag is specified */ - if ((flags & DP_F_FP_G) && !(flags & DP_F_NUM)) - omitzeros = 1; - -#if SIZEOF_LONG_LONG > 0 -# define MAX_DIGITS 18 /* grok more digits with long long */ -#else -# define MAX_DIGITS 9 /* just long */ -#endif - - /* - * Sorry, we only support several digits past the decimal because of - * our conversion method - */ - if (max > MAX_DIGITS) - max = MAX_DIGITS; - - /* Factor of 10 with the needed number of digits, e.g. 1000 for max==3 */ - mask10 = pow10_int (max); - - /* We "cheat" by converting the fractional part to integer by - * multiplying by a factor of 10 - */ - fracpart = round_int (mask10 * (ufvalue - intpart)); - - if (fracpart >= mask10) - { - intpart++; - fracpart -= mask10; - } - else if (fracpart != 0) - /* If fracpart has less digits than the 10* mask, we need to - manually insert leading 0s. For example 2.01's fractional part - requires one leading zero to distinguish it from 2.1. */ - while (fracpart < mask10 / 10) - { - ++leadingfrac0s; - mask10 /= 10; - } - -#ifdef DEBUG_SNPRINTF -# ifdef HAVE_LONG_LONG_INT - debug ("fmtfp: %Lf =? %lld.%lld\n", fvalue, intpart, fracpart); -# else - debug ("fmtfp: %Lf =? %ld.%ld\n", fvalue, intpart, fracpart); -# endif -#endif - - /* Convert integer part */ - do { - iconvert[iplace++] = (char) ('0' + (intpart % 10)); - intpart = (intpart / 10); - } while(intpart && (iplace < sizeof(iconvert))); - if (iplace == sizeof(iconvert)) iplace--; - iconvert[iplace] = 0; - - /* Convert fractional part */ - do { - fconvert[fplace++] = (char) ('0' + (fracpart % 10)); - fracpart = (fracpart / 10); - } while(fracpart && (fplace < sizeof(fconvert))); - while (leadingfrac0s-- > 0 && fplace < sizeof(fconvert)) - fconvert[fplace++] = '0'; - if (fplace == sizeof(fconvert)) fplace--; - fconvert[fplace] = 0; - if (omitzeros) - while (omitcount < fplace && fconvert[omitcount] == '0') - ++omitcount; - - /* -1 for decimal point, another -1 if we are printing a sign */ - padlen = min - iplace - (max - omitcount) - 1 - ((signvalue) ? 1 : 0); - if (!omitzeros) - zpadlen = max - fplace; - if (zpadlen < 0) - zpadlen = 0; - if (padlen < 0) - padlen = 0; - if (flags & DP_F_MINUS) - padlen = -padlen; /* Left Justifty */ - - if ((flags & DP_F_ZERO) && (padlen > 0)) - { - if (signvalue) - { - total += dopr_outch (buffer, currlen, maxlen, signvalue); - --padlen; - signvalue = 0; - } - while (padlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, '0'); - --padlen; - } - } - while (padlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, ' '); - --padlen; - } - if (signvalue) - total += dopr_outch (buffer, currlen, maxlen, signvalue); - - while (iplace > 0) - total += dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]); - - /* - * Decimal point. This should probably use locale to find the correct - * char to print out. - */ - if (max > 0 && (fplace > omitcount || zpadlen > 0)) - { - total += dopr_outch (buffer, currlen, maxlen, '.'); - - while (fplace > omitcount) - total += dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]); - } - - while (zpadlen > 0) - { - total += dopr_outch (buffer, currlen, maxlen, '0'); - --zpadlen; - } - - while (padlen < 0) - { - total += dopr_outch (buffer, currlen, maxlen, ' '); - ++padlen; - } - - return total; -} - -static int dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c) -{ - if (*currlen + 1 < maxlen) - buffer[(*currlen)++] = c; - return 1; -} - -int vsnprintf (char *str, size_t count, const char *fmt, va_list args) -{ - if (str != NULL) - str[0] = 0; - return dopr(str, count, fmt, args); -} - -int snprintf (char *str, size_t count, const char *fmt,...) -{ - va_list ap; - int total; - - va_start(ap, fmt); - total = vsnprintf(str, count, fmt, ap); - va_end(ap); - return total; -} - -#ifdef TEST_SNPRINTF -#ifndef LONG_STRING -#define LONG_STRING 1024 -#endif -int main (void) -{ - char buf1[LONG_STRING]; - char buf2[LONG_STRING]; - char *fp_fmt[] = { - "%-1.5f", - "%1.5f", - "%123.9f", - "%10.5f", - "% 10.5f", - "%+22.9f", - "%+4.9f", - "%01.3f", - "%4f", - "%3.1f", - "%3.2f", - "%.0f", - "%.1f", - NULL - }; - double fp_nums[] = { -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996, - 0.9996, 1.996, 4.136, 0}; - char *int_fmt[] = { - "%-1.5d", - "%1.5d", - "%123.9d", - "%5.5d", - "%10.5d", - "% 10.5d", - "%+22.33d", - "%01.3d", - "%4d", - NULL - }; - long int_nums[] = { -1, 134, 91340, 341, 0203, 0}; - int x, y; - int fail = 0; - int num = 0; - - printf ("Testing snprintf format codes against system sprintf...\n"); - - for (x = 0; fp_fmt[x] != NULL ; x++) - for (y = 0; fp_nums[y] != 0 ; y++) - { - snprintf (buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]); - sprintf (buf2, fp_fmt[x], fp_nums[y]); - if (strcmp (buf1, buf2)) - { - printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf = %s\n", - fp_fmt[x], buf1, buf2); - fail++; - } - num++; - } - - for (x = 0; int_fmt[x] != NULL ; x++) - for (y = 0; int_nums[y] != 0 ; y++) - { - snprintf (buf1, sizeof (buf1), int_fmt[x], int_nums[y]); - sprintf (buf2, int_fmt[x], int_nums[y]); - if (strcmp (buf1, buf2)) - { - printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf = %s\n", - int_fmt[x], buf1, buf2); - fail++; - } - num++; - } - printf ("%d tests failed out of %d.\n", fail, num); - return 0; -} -#endif /* TEST_SNPRINTF */