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snprintf.c
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/*
* NOTE: If you change this file, please merge it into rsync, samba, etc.
*/
/*
* 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, 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 -I.. -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.
*
* 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
*
* date: 2002/12/19 19:56:31; author: herb; state: Exp; lines: +2 -0
* actually print args for %g and %e
*
* date: 2002/06/03 13:37:52; author: jmcd; state: Exp; lines: +8 -0
* Since includes.h isn't included here, VA_COPY has to be defined here. I don't
* see any include file that is guaranteed to be here, so I'm defining it
* locally. Fixes AIX and Solaris builds.
*
* date: 2002/06/03 03:07:24; author: tridge; state: Exp; lines: +5 -13
* put the ifdef for HAVE_VA_COPY in one place rather than in lots of
* functions
*
* date: 2002/05/17 14:51:22; author: jmcd; state: Exp; lines: +21 -4
* Fix usage of va_list passed as an arg. Use __va_copy before using it
* when it exists.
*
* date: 2002/04/16 22:38:04; author: idra; state: Exp; lines: +20 -14
* Fix incorrect zpadlen handling in fmtfp.
* Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it.
* few mods to make it easier to compile the tests.
* added the "Ollie" test to the floating point ones.
*
* Martin Pool (mbp@samba.org) April 2003
* Remove NO_CONFIG_H so that the test case can be built within a source
* tree with less trouble.
* Remove unnecessary SAFE_FREE() definition.
*
* Martin Pool (mbp@samba.org) May 2003
* Put in a prototype for dummy_snprintf() to quiet compiler warnings.
*
* Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even
* if the C library has some snprintf functions already.
*
* Darren Tucker (dtucker@zip.com.au) 2005
* Fix bug allowing read overruns of the source string with "%.*s"
* Usually harmless unless the read runs outside the process' allocation
* (eg if your malloc does guard pages) in which case it will segfault.
* From OpenSSH. Also added test for same.
*
* Simo Sorce (idra@samba.org) Jan 2006
*
* Add support for position independent parameters
* fix fmtstr now it conforms to sprintf wrt min.max
*
**************************************************************/
#include "config.h"
#ifdef TEST_SNPRINTF /* need math library headers for testing */
/* In test mode, we pretend that this system doesn't have any snprintf
* functions, regardless of what config.h says. */
# undef HAVE_SNPRINTF
# undef HAVE_VSNPRINTF
# undef HAVE_C99_VSNPRINTF
# undef HAVE_ASPRINTF
# undef HAVE_VASPRINTF
# include <math.h>
#endif /* TEST_SNPRINTF */
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#include <sys/types.h>
#include <stdarg.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#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) {}
#endif /* HAVE_SNPRINTF, etc */
#ifdef STDC_HEADERS
#include <stddef.h>
#endif
#ifdef HAVE_LONG_DOUBLE
#define LDOUBLE long double
#else
#define LDOUBLE double
#endif
#if !defined HAVE_LONG_LONG && SIZEOF_LONG_LONG
#define HAVE_LONG_LONG 1
#endif
#ifdef HAVE_LONG_LONG
#define LLONG long long
#else
#define LLONG long
#endif
#ifndef VA_COPY
#if defined HAVE_VA_COPY || defined va_copy
#define VA_COPY(dest, src) va_copy(dest, src)
#else
#ifdef HAVE___VA_COPY
#define VA_COPY(dest, src) __va_copy(dest, src)
#else
#define VA_COPY(dest, src) (dest) = (src)
#endif
#endif
#endif
/* yes this really must be a ||. Don't muck with this (tridge) */
#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
/*
* 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_CHAR 1
#define DP_C_SHORT 2
#define DP_C_LONG 3
#define DP_C_LDOUBLE 4
#define DP_C_LLONG 5
#define DP_C_SIZET 6
/* Chunk types */
#define CNK_FMT_STR 0
#define CNK_INT 1
#define CNK_OCTAL 2
#define CNK_UINT 3
#define CNK_HEX 4
#define CNK_FLOAT 5
#define CNK_CHAR 6
#define CNK_STRING 7
#define CNK_PTR 8
#define CNK_NUM 9
#define CNK_PRCNT 10
#define char_to_int(p) ((p)- '0')
#ifndef MAX
#define MAX(p,q) (((p) >= (q)) ? (p) : (q))
#endif
struct pr_chunk {
int type; /* chunk type */
int num; /* parameter number */
int min;
int max;
int flags;
int cflags;
int start;
int len;
LLONG value;
LDOUBLE fvalue;
char *strvalue;
void *pnum;
struct pr_chunk *min_star;
struct pr_chunk *max_star;
struct pr_chunk *next;
};
struct pr_chunk_x {
struct pr_chunk **chunks;
int num;
};
static int 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,
LLONG 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);
static struct pr_chunk *new_chunk(void);
static int add_cnk_list_entry(struct pr_chunk_x **list,
int max_num, struct pr_chunk *chunk);
static int dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
{
char ch;
int state;
int pflag;
int pnum;
int pfirst;
size_t currlen;
va_list args;
const char *base;
struct pr_chunk *chunks = NULL;
struct pr_chunk *cnk = NULL;
struct pr_chunk_x *clist = NULL;
int max_pos;
int ret = -1;
VA_COPY(args, args_in);
state = DP_S_DEFAULT;
pfirst = 1;
pflag = 0;
pnum = 0;
max_pos = 0;
base = format;
ch = *format++;
/* retrieve the string structure as chunks */
while (state != DP_S_DONE) {
if (ch == '\0')
state = DP_S_DONE;
switch(state) {
case DP_S_DEFAULT:
if (cnk) {
cnk->next = new_chunk();
cnk = cnk->next;
} else {
cnk = new_chunk();
}
if (!cnk) goto done;
if (!chunks) chunks = cnk;
if (ch == '%') {
state = DP_S_FLAGS;
ch = *format++;
} else {
cnk->type = CNK_FMT_STR;
cnk->start = format - base -1;
while ((ch != '\0') && (ch != '%')) ch = *format++;
cnk->len = format - base - cnk->start -1;
}
break;
case DP_S_FLAGS:
switch (ch) {
case '-':
cnk->flags |= DP_F_MINUS;
ch = *format++;
break;
case '+':
cnk->flags |= DP_F_PLUS;
ch = *format++;
break;
case ' ':
cnk->flags |= DP_F_SPACE;
ch = *format++;
break;
case '#':
cnk->flags |= DP_F_NUM;
ch = *format++;
break;
case '0':
cnk->flags |= DP_F_ZERO;
ch = *format++;
break;
case 'I':
/* internationalization not supported yet */
ch = *format++;
break;
default:
state = DP_S_MIN;
break;
}
break;
case DP_S_MIN:
if (isdigit((unsigned char)ch)) {
cnk->min = 10 * cnk->min + char_to_int (ch);
ch = *format++;
} else if (ch == '$') {
if (!pfirst && !pflag) {
/* parameters must be all positioned or none */
goto done;
}
if (pfirst) {
pfirst = 0;
pflag = 1;
}
if (cnk->min == 0) /* what ?? */
goto done;
cnk->num = cnk->min;
cnk->min = 0;
ch = *format++;
} else if (ch == '*') {
if (pfirst) pfirst = 0;
cnk->min_star = new_chunk();
if (!cnk->min_star) /* out of memory :-( */
goto done;
cnk->min_star->type = CNK_INT;
if (pflag) {
int num;
ch = *format++;
if (!isdigit((unsigned char)ch)) {
/* parameters must be all positioned or none */
goto done;
}
for (num = 0; isdigit((unsigned char)ch); ch = *format++) {
num = 10 * num + char_to_int(ch);
}
cnk->min_star->num = num;
if (ch != '$') /* what ?? */
goto done;
} else {
cnk->min_star->num = ++pnum;
}
max_pos = add_cnk_list_entry(&clist, max_pos, cnk->min_star);
if (max_pos == 0) /* out of memory :-( */
goto done;
ch = *format++;
state = DP_S_DOT;
} else {
if (pfirst) pfirst = 0;
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 (cnk->max < 0)
cnk->max = 0;
cnk->max = 10 * cnk->max + char_to_int (ch);
ch = *format++;
} else if (ch == '$') {
if (!pfirst && !pflag) {
/* parameters must be all positioned or none */
goto done;
}
if (cnk->max <= 0) /* what ?? */
goto done;
cnk->num = cnk->max;
cnk->max = -1;
ch = *format++;
} else if (ch == '*') {
cnk->max_star = new_chunk();
if (!cnk->max_star) /* out of memory :-( */
goto done;
cnk->max_star->type = CNK_INT;
if (pflag) {
int num;
ch = *format++;
if (!isdigit((unsigned char)ch)) {
/* parameters must be all positioned or none */
goto done;
}
for (num = 0; isdigit((unsigned char)ch); ch = *format++) {
num = 10 * num + char_to_int(ch);
}
cnk->max_star->num = num;
if (ch != '$') /* what ?? */
goto done;
} else {
cnk->max_star->num = ++pnum;
}
max_pos = add_cnk_list_entry(&clist, max_pos, cnk->max_star);
if (max_pos == 0) /* out of memory :-( */
goto done;
ch = *format++;
state = DP_S_MOD;
} else {
state = DP_S_MOD;
}
break;
case DP_S_MOD:
switch (ch) {
case 'h':
cnk->cflags = DP_C_SHORT;
ch = *format++;
if (ch == 'h') {
cnk->cflags = DP_C_CHAR;
ch = *format++;
}
break;
case 'l':
cnk->cflags = DP_C_LONG;
ch = *format++;
if (ch == 'l') { /* It's a long long */
cnk->cflags = DP_C_LLONG;
ch = *format++;
}
break;
case 'L':
cnk->cflags = DP_C_LDOUBLE;
ch = *format++;
break;
case 'z':
cnk->cflags = DP_C_SIZET;
ch = *format++;
break;
default:
break;
}
state = DP_S_CONV;
break;
case DP_S_CONV:
if (cnk->num == 0) cnk->num = ++pnum;
max_pos = add_cnk_list_entry(&clist, max_pos, cnk);
if (max_pos == 0) /* out of memory :-( */
goto done;
switch (ch) {
case 'd':
case 'i':
cnk->type = CNK_INT;
break;
case 'o':
cnk->type = CNK_OCTAL;
cnk->flags |= DP_F_UNSIGNED;
break;
case 'u':
cnk->type = CNK_UINT;
cnk->flags |= DP_F_UNSIGNED;
break;
case 'X':
cnk->flags |= DP_F_UP;
case 'x':
cnk->type = CNK_HEX;
cnk->flags |= DP_F_UNSIGNED;
break;
case 'A':
/* hex float not supported yet */
case 'E':
case 'G':
case 'F':
cnk->flags |= DP_F_UP;
case 'a':
/* hex float not supported yet */
case 'e':
case 'f':
case 'g':
cnk->type = CNK_FLOAT;
break;
case 'c':
cnk->type = CNK_CHAR;
break;
case 's':
cnk->type = CNK_STRING;
break;
case 'p':
cnk->type = CNK_PTR;
cnk->flags |= DP_F_UNSIGNED;
break;
case 'n':
cnk->type = CNK_NUM;
break;
case '%':
cnk->type = CNK_PRCNT;
break;
default:
/* Unknown, bail out*/
goto done;
}
ch = *format++;
state = DP_S_DEFAULT;
break;
case DP_S_DONE:
break;
default:
/* hmm? */
break; /* some picky compilers need this */
}
}
/* retrieve the format arguments */
for (pnum = 0; pnum < max_pos; pnum++) {
int i;
if (clist[pnum].num == 0) {
/* ignoring a parameter should not be permitted
* all parameters must be matched at least once
* BUT seem some system ignore this rule ...
* at least my glibc based system does --SSS
*/
#ifdef DEBUG_SNPRINTF
printf("parameter at position %d not used\n", pnum+1);
#endif
/* eat the parameter */
va_arg (args, int);
continue;
}
for (i = 1; i < clist[pnum].num; i++) {
if (clist[pnum].chunks[0]->type != clist[pnum].chunks[i]->type) {
/* nooo noo no!
* all the references to a parameter
* must be of the same type
*/
goto done;
}
}
cnk = clist[pnum].chunks[0];
switch (cnk->type) {
case CNK_INT:
if (cnk->cflags == DP_C_SHORT)
cnk->value = va_arg (args, int);
else if (cnk->cflags == DP_C_LONG)
cnk->value = va_arg (args, long int);
else if (cnk->cflags == DP_C_LLONG)
cnk->value = va_arg (args, LLONG);
else if (cnk->cflags == DP_C_SIZET)
cnk->value = va_arg (args, ssize_t);
else
cnk->value = va_arg (args, int);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->value = cnk->value;
}
break;
case CNK_OCTAL:
case CNK_UINT:
case CNK_HEX:
if (cnk->cflags == DP_C_SHORT)
cnk->value = va_arg (args, unsigned int);
else if (cnk->cflags == DP_C_LONG)
cnk->value = (unsigned long int)va_arg (args, unsigned long int);
else if (cnk->cflags == DP_C_LLONG)
cnk->value = (LLONG)va_arg (args, unsigned LLONG);
else if (cnk->cflags == DP_C_SIZET)
cnk->value = (size_t)va_arg (args, size_t);
else
cnk->value = (unsigned int)va_arg (args, unsigned int);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->value = cnk->value;
}
break;
case CNK_FLOAT:
if (cnk->cflags == DP_C_LDOUBLE)
cnk->fvalue = va_arg (args, LDOUBLE);
else
cnk->fvalue = va_arg (args, double);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->fvalue = cnk->fvalue;
}
break;
case CNK_CHAR:
cnk->value = va_arg (args, int);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->value = cnk->value;
}
break;
case CNK_STRING:
cnk->strvalue = va_arg (args, char *);
if (!cnk->strvalue) cnk->strvalue = "(NULL)";
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->strvalue = cnk->strvalue;
}
break;
case CNK_PTR:
cnk->strvalue = va_arg (args, void *);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->strvalue = cnk->strvalue;
}
break;
case CNK_NUM:
if (cnk->cflags == DP_C_CHAR)
cnk->pnum = va_arg (args, char *);
else if (cnk->cflags == DP_C_SHORT)
cnk->pnum = va_arg (args, short int *);
else if (cnk->cflags == DP_C_LONG)
cnk->pnum = va_arg (args, long int *);
else if (cnk->cflags == DP_C_LLONG)
cnk->pnum = va_arg (args, LLONG *);
else if (cnk->cflags == DP_C_SIZET)
cnk->pnum = va_arg (args, ssize_t *);
else
cnk->pnum = va_arg (args, int *);
for (i = 1; i < clist[pnum].num; i++) {
clist[pnum].chunks[i]->pnum = cnk->pnum;
}
break;
case CNK_PRCNT:
break;
default:
/* what ?? */
goto done;
}
}
/* print out the actual string from chunks */
currlen = 0;
cnk = chunks;
while (cnk) {
int len, min, max;
if (cnk->min_star) min = cnk->min_star->value;
else min = cnk->min;
if (cnk->max_star) max = cnk->max_star->value;
else max = cnk->max;
switch (cnk->type) {
case CNK_FMT_STR:
if (maxlen != 0 && maxlen > currlen) {
if (maxlen > (currlen + cnk->len)) len = cnk->len;
else len = maxlen - currlen;
memcpy(&(buffer[currlen]), &(base[cnk->start]), len);
}
currlen += cnk->len;
break;
case CNK_INT:
case CNK_UINT:
fmtint (buffer, &currlen, maxlen, cnk->value, 10, min, max, cnk->flags);
break;
case CNK_OCTAL:
fmtint (buffer, &currlen, maxlen, cnk->value, 8, min, max, cnk->flags);
break;
case CNK_HEX:
fmtint (buffer, &currlen, maxlen, cnk->value, 16, min, max, cnk->flags);
break;
case CNK_FLOAT:
fmtfp (buffer, &currlen, maxlen, cnk->fvalue, min, max, cnk->flags);
break;
case CNK_CHAR:
dopr_outch (buffer, &currlen, maxlen, cnk->value);
break;
case CNK_STRING:
if (max == -1) {
max = strlen(cnk->strvalue);
}
fmtstr (buffer, &currlen, maxlen, cnk->strvalue, cnk->flags, min, max);
break;
case CNK_PTR:
fmtint (buffer, &currlen, maxlen, (long)(cnk->strvalue), 16, min, max, cnk->flags);
break;
case CNK_NUM:
if (cnk->cflags == DP_C_CHAR)
*((char *)(cnk->pnum)) = (char)currlen;
else if (cnk->cflags == DP_C_SHORT)
*((short int *)(cnk->pnum)) = (short int)currlen;
else if (cnk->cflags == DP_C_LONG)
*((long int *)(cnk->pnum)) = (long int)currlen;
else if (cnk->cflags == DP_C_LLONG)
*((LLONG *)(cnk->pnum)) = (LLONG)currlen;
else if (cnk->cflags == DP_C_SIZET)
*((ssize_t *)(cnk->pnum)) = (ssize_t)currlen;
else
*((int *)(cnk->pnum)) = (int)currlen;
break;
case CNK_PRCNT:
dopr_outch (buffer, &currlen, maxlen, '%');
break;
default:
/* what ?? */
goto done;
}
cnk = cnk->next;
}
if (maxlen != 0) {
if (currlen < maxlen - 1)
buffer[currlen] = '\0';
else if (maxlen > 0)
buffer[maxlen - 1] = '\0';
}
ret = currlen;
done:
va_end(args);
while (chunks) {
cnk = chunks->next;
free(chunks);
chunks = cnk;
}
if (clist) {
for (pnum = 0; pnum < max_pos; pnum++) {
if (clist[pnum].chunks) free(clist[pnum].chunks);
}
free(clist);
}
return ret;
}
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; strln < max && value[strln]; ++strln); /* strlen */
padlen = min - strln;
if (padlen < 0)
padlen = 0;
if (flags & DP_F_MINUS)
padlen = -padlen; /* Left Justify */
while (padlen > 0) {
dopr_outch (buffer, currlen, maxlen, ' ');
--padlen;
}
while (*value && (cnt < max)) {
dopr_outch (buffer, currlen, maxlen, *value++);
++cnt;
}
while (padlen < 0) {
dopr_outch (buffer, currlen, maxlen, ' ');
++padlen;
}
}
/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
LLONG value, int base, int min, int max, int flags)
{
int signvalue = 0;
unsigned LLONG uvalue;
char convert[20];
int place = 0;
int spadlen = 0; /* amount to space pad */
int zpadlen = 0; /* amount to zero pad */
int caps = 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) caps = 1; /* Should characters be upper case? */
do {
convert[place++] =
(caps? "0123456789ABCDEF":"0123456789abcdef")
[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 */
if (zpadlen > 0) {
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 abs_val(LDOUBLE value)
{
LDOUBLE result = value;
if (value < 0)
result = -value;
return result;
}
static LDOUBLE POW10(int exp)
{
LDOUBLE result = 1;
while (exp) {
result *= 10;
exp--;
}
return result;
}
static LLONG 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;
LLONG l=0;
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];
int iplace = 0;
int fplace = 0;
int padlen = 0; /* amount to pad */
int zpadlen = 0;
int caps = 0;
int idx;
double intpart;
double fracpart;
double temp;
/*
* 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) {