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eterm/libmej/snprintf.c

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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#ifdef HAVE_STDARG_H
# include <stdarg.h>
#endif
static const char cvs_ident[] = "$Id$";
/*
* Shamelessly snarfed from Enlightenment...
* which shamelessly snarfed from sane...
* which shamelessly snarfed from LPR
* which probably shamelessly snarfed from....
*
* Moved comments to end so I can actually read the code.. cleaned out useless
* junk....
*/
#if !defined(HAVE_SNPRINTF) || (HAVE_SNPRINTF_BUG == 1)
#define VA_LOCAL_DECL va_list ap
#define VA_START(f) va_start(ap, f)
#define VA_SHIFT(v,t) ; /* no-op for ANSI */
#define VA_END va_end(ap)
/*
* dopr(): poor man's version of doprintf
*/
static void dopr(char *buffer, const char *format, va_list args);
static void fmtstr(char *value, int ljust, int len, int zpad, int precision);
static void fmtnum(long value, int base, int dosign,
int ljust, int len, int zpad, int precision);
static void fmtdouble(int fmt, double value,
int ljust, int len, int zpad, int precision);
static void dostr(char *);
static char *output;
static void dopr_outch(int c);
static char *end;
int visible_control = 1;
int
vsnprintf(char *str, size_t count, const char *fmt, va_list args)
{
str[0] = 0;
end = str + count - 1;
dopr(str, fmt, args);
if (count > 0) {
end[0] = 0;
}
return (strlen(str));
}
#ifdef HAVE_STDARG_H
int
snprintf(char *str, size_t count, const char *fmt,...)
#else
int
snprintf(va_alist)
va_dcl
#endif
{
#ifndef HAVE_STDARG_H
char *str;
size_t count;
char *fmt;
#endif
VA_LOCAL_DECL;
VA_START(fmt);
VA_SHIFT(str, char *);
VA_SHIFT(count, size_t);
VA_SHIFT(fmt, char *);
(void) vsnprintf(str, count, fmt, ap);
VA_END;
return (strlen(str));
}
static void
dopr(char *buffer, const char *format, va_list args)
{
int ch;
long value;
int longflag = 0;
char *strvalue;
int ljust;
int len;
int zpad;
int precision;
int set_precision;
double dval;
output = buffer;
while ((ch = *format++)) {
switch (ch) {
case '%':
ljust = len = zpad = 0;
precision = -1;
set_precision = 0;
nextch:
ch = *format++;
switch (ch) {
case 0:
dostr("**end of format**");
return;
case '-':
ljust = 1;
goto nextch;
case '.':
set_precision = 1;
precision = 0;
goto nextch;
case '*':
len = va_arg(args, int);
goto nextch;
case '0': /* set zero padding if len not set */
if (len == 0 && set_precision == 0)
zpad = '0';
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (set_precision) {
precision = precision * 10 + ch - '0';
} else {
len = len * 10 + ch - '0';
}
goto nextch;
case 'l':
longflag = 1;
goto nextch;
case 'u':
case 'U':
/*fmtnum(value,base,dosign,ljust,len, zpad, precision) */
if (longflag) {
value = va_arg(args, long);
} else {
value = va_arg(args, int);
}
fmtnum(value, 10, 0, ljust, len, zpad, precision);
break;
case 'o':
case 'O':
/*fmtnum(value,base,dosign,ljust,len, zpad, precision) */
if (longflag) {
value = va_arg(args, long);
} else {
value = va_arg(args, int);
}
fmtnum(value, 8, 0, ljust, len, zpad, precision);
break;
case 'd':
case 'i':
case 'D':
if (longflag) {
value = va_arg(args, long);
} else {
value = va_arg(args, int);
}
fmtnum(value, 10, 1, ljust, len, zpad, precision);
break;
case 'x':
if (longflag) {
value = va_arg(args, long);
} else {
value = va_arg(args, int);
}
fmtnum(value, 16, 0, ljust, len, zpad, precision);
break;
case 'X':
if (longflag) {
value = va_arg(args, long);
} else {
value = va_arg(args, int);
}
fmtnum(value, -16, 0, ljust, len, zpad, precision);
break;
case 's':
strvalue = va_arg(args, char *);
fmtstr(strvalue, ljust, len, zpad, precision);
break;
case 'c':
ch = va_arg(args, int);
{
char b[2];
int vsb = visible_control;
b[0] = ch;
b[1] = 0;
visible_control = 0;
fmtstr(b, ljust, len, zpad, precision);
visible_control = vsb;
}
break;
case 'f':
case 'g':
dval = va_arg(args, double);
fmtdouble(ch, dval, ljust, len, zpad, precision);
break;
case '%':
dopr_outch(ch);
continue;
default:
dostr("???????");
}
longflag = 0;
break;
default:
dopr_outch(ch);
break;
}
}
*output = 0;
}
/*
* Format '%[-]len[.precision]s'
* - = left justify (ljust)
* len = minimum length
* precision = numbers of chars in string to use
*/
static void
fmtstr(char *value, int ljust, int len, int zpad, int precision)
{
int padlen, strlen, i, c; /* amount to pad */
zpad = 0;
if (value == 0) {
value = "<NULL>";
}
if (precision > 0) {
strlen = precision;
} else {
/* cheap strlen so you do not have library call */
for (strlen = 0; (c = value[strlen]); ++strlen) {
if (visible_control && iscntrl(c) && !isspace(c)) {
++strlen;
}
}
}
padlen = len - strlen;
if (padlen < 0)
padlen = 0;
if (ljust)
padlen = -padlen;
while (padlen > 0) {
dopr_outch(' ');
--padlen;
}
/* output characters */
for (i = 0; (c = value[i]); ++i) {
if (visible_control && iscntrl(c) && !isspace(c)) {
dopr_outch('^');
c = ('@' | (c & 0x1F));
}
dopr_outch(c);
}
while (padlen < 0) {
dopr_outch(' ');
++padlen;
}
}
static void
fmtnum(long value, int base, int dosign, int ljust,
int len, int zpad, int precision)
{
int signvalue = 0;
unsigned long uvalue;
char convert[20];
int place = 0;
int padlen = 0; /* amount to pad */
int caps = 0;
precision = 0;
/* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n",
* value, base, dosign, ljust, len, zpad )); */
uvalue = value;
if (dosign) {
if (value < 0) {
signvalue = '-';
uvalue = -value;
}
}
if (base < 0) {
caps = 1;
base = -base;
}
do {
convert[place++] =
(caps ? "0123456789ABCDEF" : "0123456789abcdef")
[uvalue % (unsigned) base];
uvalue = (uvalue / (unsigned) base);
}
while (uvalue);
convert[place] = 0;
padlen = len - place;
if (padlen < 0)
padlen = 0;
if (ljust)
padlen = -padlen;
/* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n",
* convert,place,signvalue,padlen)); */
if (zpad && padlen > 0) {
if (signvalue) {
dopr_outch(signvalue);
--padlen;
signvalue = 0;
}
while (padlen > 0) {
dopr_outch(zpad);
--padlen;
}
}
while (padlen > 0) {
dopr_outch(' ');
--padlen;
}
if (signvalue)
dopr_outch(signvalue);
while (place > 0)
dopr_outch(convert[--place]);
while (padlen < 0) {
dopr_outch(' ');
++padlen;
}
}
static void
fmtdouble(int fmt, double value, int ljust, int len, int zpad, int precision)
{
char convert[128];
char fmtstr[128];
int l;
zpad = 0;
if (len == 0)
len = 10;
if (len > (int) sizeof(convert) - 10) {
len = (int) sizeof(convert) - 10;
}
if (precision > (int) sizeof(convert) - 10) {
precision = (int) sizeof(convert) - 10;
}
if (precision > len)
precision = len;
strcpy(fmtstr, "%");
if (ljust)
strcat(fmtstr, "-");
if (len) {
sprintf(fmtstr + strlen(fmtstr), "%d", len);
}
if (precision > 0) {
sprintf(fmtstr + strlen(fmtstr), ".%d", precision);
}
l = strlen(fmtstr);
fmtstr[l] = fmt;
fmtstr[l + 1] = 0;
sprintf(convert, fmtstr, value);
dostr(convert);
}
static void
dostr(char *str)
{
while (*str)
dopr_outch(*str++);
}
static void
dopr_outch(int c)
{
if (end == 0 || output < end) {
*output++ = c;
}
}
/**************************************************************
* 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...
*
* plp_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.
**************************************************************/
/***************************************************************************
* LPRng - An Extended Print Spooler System
*
* Copyright 1988-1997, Patrick Powell, San Diego, CA
* papowell@sdsu.edu
* See below for conditions of use.
*
***************************************************************************
* MODULE: snprintf.c
* PURPOSE: LPRng version of printf - absolutely bombproof (hopefully!)
**************************************************************************/
/*
* The "Artistic License"
*
* Preamble
*
* The intent of this document is to state the conditions under which a
* Package may be copied, such that the Copyright Holder maintains some
* semblance of artistic control over the development of the package,
* while giving the users of the package the right to use and distribute
* the Package in a more-or-less customary fashion, plus the right to make
* reasonable modifications.
*
* Definitions:
*
* "Package" refers to the collection of files distributed by the
* Copyright Holder, and derivatives of that collection of files
* created through textual modification.
*
* "Standard Version" refers to such a Package if it has not been
* modified, or has been modified in accordance with the wishes
* of the Copyright Holder as specified below.
*
* "Copyright Holder" is whoever is named in the copyright or
* copyrights for the package.
*
* "You" is you, if you are thinking about copying or distributing
* this Package.
*
* "Reasonable copying fee" is whatever you can justify on the
* basis of media cost, duplication charges, time of people involved,
* and so on. (You will not be required to justify it to the
* Copyright Holder, but only to the computing community at large
* as a market that must bear the fee.)
*
* "libmej_freely Available" means that no fee is charged for the item
* itself, though there may be fees involved in handling the item.
* It also means that recipients of the item may redistribute it
* under the same conditions they received it.
*
* 1. You may make and give away verbatim copies of the source form of the
* Standard Version of this Package without restriction, provided that you
* duplicate all of the original copyright notices and associated disclaimers.
*
* 2. You may apply bug fixes, portability fixes and other modifications
* derived from the Public Domain or from the Copyright Holder. A Package
* modified in such a way shall still be considered the Standard Version.
*
* 3. You may otherwise modify your copy of this Package in any way, provided
* that you insert a prominent notice in each changed file stating how and
* when you changed that file, and provided that you do at least ONE of the
* following:
*
* a) place your modifications in the Public Domain or otherwise make them
* libmej_freely Available, such as by posting said modifications to Usenet or
* an equivalent medium, or placing the modifications on a major archive
* site such as uunet.uu.net, or by allowing the Copyright Holder to include
* your modifications in the Standard Version of the Package.
*
* b) use the modified Package only within your corporation or organization.
*
* c) rename any non-standard executables so the names do not conflict
* with standard executables, which must also be provided, and provide
* a separate manual page for each non-standard executable that clearly
* documents how it differs from the Standard Version.
*
* d) make other distribution arrangements with the Copyright Holder.
*
* 4. You may distribute the programs of this Package in object code or
* executable form, provided that you do at least ONE of the following:
*
* a) distribute a Standard Version of the executables and library files,
* together with instructions (in the manual page or equivalent) on where
* to get the Standard Version.
*
* b) accompany the distribution with the machine-readable source of
* the Package with your modifications.
*
* c) give non-standard executables non-standard names, and clearly
* document the differences in manual pages (or equivalent), together
* with instructions on where to get the Standard Version.
*
* d) make other distribution arrangements with the Copyright Holder.
*
* 5. You may charge a reasonable copying fee for any distribution of this
* Package. You may charge any fee you choose for support of this
* Package. You may not charge a fee for this Package itself. However,
* you may distribute this Package in aggregate with other (possibly
* commercial) programs as part of a larger (possibly commercial) software
* distribution provided that you do not advertise this Package as a
* product of your own.
*
* 6. The name of the Copyright Holder may not be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* 7. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* The End
*/
#endif /* HAVE_SNPRINTF */
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