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elinks/src/util/snprintf.c
Laurent MONIN df065ead80 Remove now useless $Id: lines.
2005-10-21 09:14:07 +02:00

1030 lines
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/* Own portable snprintf() implementation */
/* These sources aren't the officially distributed version, they are modified
* by us (ELinks coders) and some other third-party hackers. See ELinks
* ChangeLog for details about changes we made here, comments bellow may give
* you some indices as well. --pasky */
/*
* 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
*/
/**************************************************************
* 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 <blong@fiction.net> 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 <blong@fiction.net> 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, formated 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 <roessler@guug.de> 01/27/98 for mutt 0.89i
* The PGP code was using unsigned hexadecimal formats.
* Unfortunately, unsigned formats simply didn't work.
*
* Michael Elkins <me@cs.hmc.edu> 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.
*
* === Samba hacking:
*
* Andrew Tridgell (tridge@samba.org) Oct 1998
* fixed handling of %.0f
* added test for HAVE_LONG_DOUBLE
*
* tridge@samba.org, idra@samba.org, April 2001
* got rid of fcvt code (twas buggy and made testing harder)
* added C99 semantics
*
* === About ELinks changes see ELinks' ChangeLog.
*
**************************************************************/
#ifdef HAVE_CONFIG_H /* for some tests */
#include "config.h"
#endif
#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "elinks.h"
#include "util/snprintf.h"
/* #define TEST_SNPRINTF */ /* For compiling a standlone test binary. */
#if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF)
/* only include stdio.h if we are not re-defining snprintf or vsnprintf */
#include <stdio.h>
/* make the compiler happy with an empty file */
void dummy_snprintf(void);
void dummy_snprintf(void) {}
#else /* defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF) */
/* TODO: Don't do all this if we just need to get own snprintf() wrapper to
* system-provided vsnprintf(). (What an unlikely case, isn't it?) */
#ifdef HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif
#ifdef HAVE_LONG_LONG
#define LLONG long long
#else
#define LLONG long
#endif
static size_t dopr(char *buffer, size_t maxlen, const char *format,
va_list args_in);
static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
char *value, int flags, int min, int max);
static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
long value, int base, int min, int max, int flags);
static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
LDOUBLE fvalue, int min, int max, int flags);
static void 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_CONV 6
#define DP_S_DONE 7
/* 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)
/* Conversion Flags */
#define DP_C_SHORT 1
#define DP_C_LONG 2
#define DP_C_LDOUBLE 3
#define DP_C_LLONG 4
#define char_to_int(p) ((p)- '0')
static char hexnumbers[] = "0123456789abcdef";
static char HEXnumbers[] = "0123456789ABCDEF";
static inline void
dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
{
if (*currlen < maxlen)
buffer[(*currlen)] = c;
(*currlen)++;
}
static size_t
dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
char ch;
LLONG value;
LDOUBLE fvalue;
char *strvalue;
int min;
int max;
int state;
int flags;
int cflags;
size_t currlen;
va_list args;
VA_COPY(args, args_in);
state = DP_S_DEFAULT;
currlen = 0;
flags = cflags = min = 0;
max = -1;
ch = *format++;
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
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 (isdigit((unsigned char) ch)) {
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 (isdigit((unsigned char) ch)) {
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++;
if (ch == 'l') { /* It's a long long */
cflags = DP_C_LLONG;
ch = *format++;
}
break;
case 'L':
cflags = DP_C_LDOUBLE;
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 = va_arg(args, int);
else if (cflags == DP_C_LONG)
value = va_arg(args, long);
else if (cflags == DP_C_LLONG)
value = va_arg(args, LLONG);
else
value = va_arg(args, int);
fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
break;
case 'o':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg(args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long) va_arg(args, unsigned long);
else if (cflags == DP_C_LLONG)
value = (long) va_arg(args, unsigned LLONG);
else
value = (long) va_arg(args, unsigned int);
fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
break;
case 'u':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg(args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long) va_arg(args, unsigned long);
else if (cflags == DP_C_LLONG)
value = (LLONG) va_arg(args, unsigned LLONG);
else
value = (long) va_arg(args, unsigned int);
fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
break;
case 'X':
flags |= DP_F_UP;
case 'x':
flags |= DP_F_UNSIGNED;
if (cflags == DP_C_SHORT)
value = va_arg(args, unsigned int);
else if (cflags == DP_C_LONG)
value = (long) va_arg(args, unsigned long);
else if (cflags == DP_C_LLONG)
value = (LLONG) va_arg(args, unsigned LLONG);
else
value = (long) va_arg(args, unsigned int);
fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
break;
case 'f':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
/* um, floating point? */
fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
break;
case 'E':
flags |= DP_F_UP;
case 'e':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
break;
case 'G':
flags |= DP_F_UP;
case 'g':
if (cflags == DP_C_LDOUBLE)
fvalue = va_arg(args, LDOUBLE);
else
fvalue = va_arg(args, double);
fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
break;
case 'c':
dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
break;
case 's':
strvalue = va_arg(args, char *);
if (!strvalue) strvalue = "(NULL)";
if (max == -1) {
max = strlen(strvalue);
}
if (min > 0 && max >= 0 && min > max) max = min;
fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
break;
case 'p':
strvalue = va_arg(args, void *);
fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
break;
case 'n':
if (cflags == DP_C_SHORT) {
short *num;
num = va_arg(args, short *);
*num = currlen;
} else if (cflags == DP_C_LONG) {
long *num;
num = va_arg(args, long *);
*num = (long) currlen;
} else if (cflags == DP_C_LLONG) {
LLONG *num;
num = va_arg(args, LLONG *);
*num = (LLONG) currlen;
} else {
int *num;
num = va_arg(args, int *);
*num = currlen;
}
break;
case '%':
dopr_outch(buffer, &currlen, maxlen, ch);
break;
case 'w':
/* not supported yet, treat as next char */
ch = *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 (maxlen != 0) {
if (currlen < maxlen - 1)
buffer[currlen] = '\0';
else if (maxlen > 0)
buffer[maxlen - 1] = '\0';
}
return currlen;
}
static void
fmtstr(char *buffer, size_t *currlen, size_t maxlen,
char *value, int flags, int min, int max)
{
int padlen, strln; /* amount to pad */
int cnt = 0;
#ifdef DEBUG_SNPRINTF
printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
#endif
if (value == 0) value = "<NULL>";
for (strln = 0; value[strln]; ++strln); /* strlen */
padlen = min - strln;
if (padlen < 0)
padlen = 0;
if (flags & DP_F_MINUS)
padlen = -padlen; /* Left Justify */
while ((padlen > 0) && (cnt < max)) {
dopr_outch(buffer, currlen, maxlen, ' ');
--padlen;
++cnt;
}
while (*value && (cnt < max)) {
dopr_outch(buffer, currlen, maxlen, *value++);
++cnt;
}
while ((padlen < 0) && (cnt < max)) {
dopr_outch(buffer, currlen, maxlen, ' ');
++padlen;
++cnt;
}
}
/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
static void
fmtint(char *buffer, size_t *currlen, size_t maxlen,
long value, int base, int min, int max, int flags)
{
int signvalue = 0;
unsigned long uvalue;
char convert[20];
char *numbers = (char *) &hexnumbers;
int place = 0;
int spadlen = 0; /* amount to space pad */
int zpadlen = 0; /* amount to zero pad */
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? */
numbers = (char *) &HEXnumbers;
}
do {
convert[place++] = numbers[uvalue % (unsigned) base];
uvalue = (uvalue / (unsigned) base);
} while (uvalue && (place < 20));
if (place == 20) place--;
convert[place] = 0;
zpadlen = max - place;
spadlen = min - MAX(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
printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
zpadlen, spadlen, min, max, place);
#endif
/* Spaces */
while (spadlen > 0) {
dopr_outch(buffer, currlen, maxlen, ' ');
--spadlen;
}
/* Sign */
if (signvalue)
dopr_outch(buffer, currlen, maxlen, signvalue);
/* Zeros */
while (zpadlen > 0) {
dopr_outch(buffer, currlen, maxlen, '0');
--zpadlen;
}
/* Digits */
while (place > 0)
dopr_outch(buffer, currlen, maxlen, convert[--place]);
/* Left Justified spaces */
while (spadlen < 0) {
dopr_outch(buffer, currlen, maxlen, ' ');
++spadlen;
}
}
static LDOUBLE
my_abs(LDOUBLE value)
{
LDOUBLE result = value;
if (value < 0)
result = -value;
return result;
}
static LDOUBLE
my_pow10(int exp)
{
LDOUBLE result = 1;
while (exp) {
result *= 10;
exp--;
}
return result;
}
static LLONG
my_round(LDOUBLE value)
{
LLONG intpart;
intpart = (LLONG) value;
value = value - intpart;
if (value >= 0.5) intpart++;
return intpart;
}
/* a replacement for modf that doesn't need the math library. Should
be portable, but slow */
static double
my_modf(double x0, double *iptr)
{
int i;
long l;
double x = x0;
double f = 1.0;
for (i = 0; i < 100; i++) {
l = (long) x;
if (l <= (x + 1) && l >= (x - 1)) break;
x *= 0.1;
f *= 10.0;
}
if (i == 100) {
/* yikes! the number is beyond what we can handle. What do we do? */
(*iptr) = 0;
return 0;
}
if (i != 0) {
double i2;
double ret;
ret = my_modf(x0 - l * f, &i2);
(*iptr) = l * f + i2;
return ret;
}
(*iptr) = l;
return x - (*iptr);
}
static void
fmtfp(char *buffer, size_t *currlen, size_t maxlen,
LDOUBLE fvalue, int min, int max, int flags)
{
int signvalue = 0;
double ufvalue;
char iconvert[311];
char fconvert[311];
char *numbers = (char *) &hexnumbers;
int iplace = 0;
int fplace = 0;
int padlen = 0; /* amount to pad */
int zpadlen = 0;
int index;
double intpart;
double fracpart;
double temp;
LDOUBLE pow;
/*
* 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 = my_abs(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? */
numbers = (char *) &HEXnumbers;
}
#endif
#if 0
if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
#endif
/*
* Sorry, we only support 16 digits past the decimal because of our
* conversion method
*/
if (max > 16)
max = 16;
pow = my_pow10(max);
/* We "cheat" by converting the fractional part to integer by
* multiplying by a factor of 10
*/
temp = ufvalue;
my_modf(temp, &intpart);
fracpart = my_round(pow * (ufvalue - intpart));
if (fracpart >= pow) {
intpart++;
fracpart -= pow;
}
/* Convert integer part */
do {
temp = intpart * 0.1;
my_modf(temp, &intpart);
index = (int) ((temp - intpart + 0.05) * 10.0);
#if 0
index = (int) (((double) (temp*0.1) -intpart +0.05) *10.0);
printf ("%llf, %f, %x\n", temp, intpart, index);
#endif
iconvert[iplace++] = numbers[index];
} while (intpart && (iplace < 311));
if (iplace == 311) iplace--;
iconvert[iplace] = 0;
/* Convert fractional part */
if (fracpart) {
do {
temp = fracpart * 0.1;
my_modf(temp, &fracpart);
index = (int) ((temp - fracpart + 0.05) * 10.0);
#if 0
index = (int) ((((temp/10) -fracpart) +0.05) *10);
printf ("%lf, %lf, %ld\n", temp, fracpart, index);
#endif
fconvert[fplace++] = numbers[index];
} while (fracpart && (fplace < 311));
if (fplace == 311) fplace--;
}
fconvert[fplace] = 0;
/* -1 for decimal point, another -1 if we are printing a sign */
padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
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) {
dopr_outch(buffer, currlen, maxlen, signvalue);
--padlen;
signvalue = 0;
}
while (padlen > 0) {
dopr_outch(buffer, currlen, maxlen, '0');
--padlen;
}
}
while (padlen > 0) {
dopr_outch(buffer, currlen, maxlen, ' ');
--padlen;
}
if (signvalue)
dopr_outch(buffer, currlen, maxlen, signvalue);
while (iplace > 0)
dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);
#ifdef DEBUG_SNPRINTF
printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
#endif
/*
* Decimal point. This should probably use locale to find the correct
* char to print out.
*/
if (max > 0) {
dopr_outch(buffer, currlen, maxlen, '.');
while (zpadlen > 0) {
dopr_outch(buffer, currlen, maxlen, '0');
--zpadlen;
}
while (fplace > 0)
dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
}
while (padlen < 0) {
dopr_outch(buffer, currlen, maxlen, ' ');
++padlen;
}
}
/* Yes the following preprocessor conditions really must be a ||. Don't muck
* with this. -- tridge
*
* The logic for these is that we need our own definition if the OS *either*
* has no definition of *sprintf, or if it does have one that doesn't work
* properly according to the autoconf test. -- mbp */
#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
int
elinks_vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
return dopr(str, count, fmt, args);
}
#endif
#if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
int
elinks_snprintf(char *str, size_t count, const char *fmt, ...)
{
size_t ret;
va_list ap;
va_start(ap, fmt);
/* snprintf.h makes this to expand to the right thing. */
ret = vsnprintf(str, count, fmt, ap);
va_end(ap);
return ret;
}
#endif
#endif /* defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF) */
#ifndef HAVE_VASPRINTF
int
elinks_vasprintf(char **ptr, const char *format, va_list ap)
{
int ret;
va_list ap2;
VA_COPY(ap2, ap);
ret = vsnprintf(NULL, 0, format, ap2);
if (ret <= 0) return ret;
/* Should we use mem_alloc() here instead of malloc() ??? --Zas */
/* No: This is an alternative to the system vasprintf.
* When the system provides vasprintf, it will use malloc(),
* which means that the string will need to be freed with free().
* If we did use mem_alloc here in our alternative to the system
* vasprintf, we would need to change all users of the memory
* allocated by vasprintf to take into account whether the system
* vasprintf (and therefore malloc) or our own vasprintf
* (and therefore mem_alloc) were used. -- Miciah */
(*ptr) = (char *) malloc(ret + 1);
if (!*ptr) return -1;
VA_COPY(ap2, ap);
return vsnprintf(*ptr, ret + 1, format, ap2);
}
#endif
#ifndef HAVE_ASPRINTF
int
elinks_asprintf(char **ptr, const char *format, ...)
{
va_list ap;
int ret;
*ptr = NULL;
va_start(ap, format);
ret = vasprintf(ptr, format, ap);
va_end(ap);
return ret;
}
#endif
unsigned char *
asprintfa(const char *fmt, ...)
{
unsigned char *str;
va_list ap;
va_start(ap, fmt);
str = vasprintfa(fmt, ap);
va_end(ap);
return str;
}
/* Test program */
#ifdef TEST_SNPRINTF
#include <math.h>
int sprintf(char *str,const char *fmt,...);
int
main(void)
{
char buf1[1024];
char buf2[1024];
char *fp_fmt[] = {
"%1.1f",
"%-1.5f",
"%1.5f",
"%123.9f",
"%10.5f",
"% 10.5f",
"%+22.9f",
"%+4.9f",
"%01.3f",
"%4f",
"%3.1f",
"%3.2f",
"%.0f",
"%f",
"-16.16f",
NULL
};
double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2,
341.1234, 0203.9, 0.96, 0.996,
0.9996, 1.996, 4.136, 5.030201, 0};
char *int_fmt[] = {
"%-1.5d",
"%1.5d",
"%123.9d",
"%5.5d",
"%10.5d",
"% 10.5d",
"%+22.33d",
"%01.3d",
"%4d",
"%d",
NULL
};
long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
char *str_fmt[] = {
"10.5s",
"5.10s",
"10.1s",
"0.10s",
"10.0s",
"1.10s",
"%s",
"%.1s",
"%.10s",
"%10s",
NULL
};
char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
int x, y;
int fail = 0;
int num = 0;
printf ("Testing snprintf format codes against system sprintf...\n");
for (x = 0; fp_fmt[x] ; x++) {
for (y = 0; fp_nums[y] != 0 ; y++) {
int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
int l2 = 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\t"
"snprintf = [%s]\n\t sprintf = [%s]\n",
fp_fmt[x], buf1, buf2);
fail++;
}
if (l1 != l2) {
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
fail++;
}
num++;
}
}
for (x = 0; int_fmt[x] ; x++) {
for (y = 0; int_nums[y] != 0 ; y++) {
int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
int l2 = 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\t"
"snprintf = [%s]\n\t sprintf = [%s]\n",
int_fmt[x], buf1, buf2);
fail++;
}
if (l1 != l2) {
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
fail++;
}
num++;
}
}
for (x = 0; str_fmt[x] ; x++) {
for (y = 0; str_vals[y] != 0 ; y++) {
int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
sprintf(buf2, str_fmt[x], str_vals[y]);
if (strcmp(buf1, buf2)) {
printf("snprintf doesn't match Format: %s\n\t"
"snprintf = [%s]\n\t sprintf = [%s]\n",
str_fmt[x], buf1, buf2);
fail++;
}
if (l1 != l2) {
printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
fail++;
}
num++;
}
}
printf ("%d tests failed out of %d.\n", fail, num);
printf("seeing how many digits we support\n");
{
double v0 = 0.12345678901234567890123456789012345678901;
for ( x = 0; x < 100; x++) {
double p = pow(10, x);
double r = v0*p;
snprintf(buf1, sizeof(buf1), "%1.1f", r);
sprintf(buf2,"%1.1f", r);
if (strcmp(buf1, buf2)) {
printf("we seem to support %d digits\n", x-1);
break;
}
}
}
return 0;
}
#endif /* SNPRINTF_TEST */
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