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update private snprintf to a GPL'ed version

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This commit is contained in:
marschap
2007-04-27 16:50:45 +00:00
parent 149f9c824a
commit ced4dddf07
2 changed files with 215 additions and 111 deletions
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ChangeLog
+1
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@@ -10,6 +10,7 @@ v.0.5dev (ongoing development)
+ xosd driver: offset from top-left corner
+ LCDd: Hello= config option for startup message
* glk driver: bignum support fixed
* update local snprintf to the last one, which is GPL
v.0.5.2
* fix switching on/off the Load screen in lcdproc client using the menu
shared/snprintf.c
+214 -111
View File
@@ -4,20 +4,22 @@
* AUTHOR
* Mark Martinec <mark.martinec@ijs.si>, April 1999.
*
* Copyright 1999, Mark Martinec. All rights reserved.
* Copyright 1999-2002 Mark Martinec. All rights reserved.
*
* TERMS AND CONDITIONS
* This program is free software; you can redistribute it and/or modify
* it under the terms of the "Frontier Artistic License" which comes
* with this Kit.
* This program is free software; it is dual licensed, the terms of the
* "Frontier Artistic License" or the "GNU General Public License"
* can be chosen at your discretion. The chosen license then applies
* solely and in its entirety. Both licenses come with this Kit.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the Frontier Artistic License for more details.
* See the license for more details.
*
* You should have received a copy of the Frontier Artistic License
* with this Kit in the file named LICENSE.txt .
* You should have received a copy of the "Frontier Artistic License"
* with this Kit in the file named LICENSE.txt, and the copy of
* the "GNU General Public License" in the file named LICENSE-GPL.txt.
* If not, I'll be glad to provide one.
*
* FEATURES
@@ -28,14 +30,16 @@
* optimizations turned on, tell the compiler the code is strict ANSI
* if necessary to give it more freedom for optimizations);
* - return value semantics per ISO/IEC 9899:1999 ("ISO C99");
* - written in standard ISO/ANSI C - requires an ANSI C compiler.
* - written in standard ISO/ANSI C - requires an ANSI C compiler;
* - works also with non-ASCII 8-bit character sets (e.g. EBCDIC)
* provided strings are '\0'-terminated.
*
* SUPPORTED CONVERSION SPECIFIERS AND DATA TYPES
*
* This snprintf only supports the following conversion specifiers:
* s, c, d, u, o, x, X, p (and synonyms: i, D, U, O - see below)
* with flags: '-', '+', ' ', '0' and '#'.
* An asterisk is supported for field width as well as precision.
* An asterisk is supported for field width and for the precision.
*
* Length modifiers 'h' (short int), 'l' (long int),
* and 'll' (long long int) are supported.
@@ -182,6 +186,36 @@
* - several comments rephrased and new ones added;
* - make compiler not complain about 'credits' defined but
* not used;
* 2001-08 V2.3 Mark Martinec <mark.martinec@ijs.si>
* .. 2002-02 - writeback conversion specifier 'n' is now supported;
* - bump the size of a temporary buffer for simple
* numeric->string conversion from 32 to 48 characters
* in anticipation of 128-bit machines;
* - added #include <stddef.h> and <stdarg.h> to snprintf.h;
* - fixed one assert in test.c
* (thanks to Tuomo A Turunen for reporting this problem);
* - portability fix: use isdigit() provided with <ctype.h>
* and do not assume character set is ASCII - call strtoul()
* if needed to convert field width and precision;
* - check for broken or non-ANSI native sprintf (e.g. SunOS)
* which does not return string lenth, and work around it;
* - shouldn't happen, but just in case (applies to numeric
* conversions only): added assertion after a call to
* system's sprintf to make sure we detect a problem
* as it happens (or very shortly - but still - after a
* buffer overflow occured for some strange reason
* in system's sprintf);
* - cleanup: avoid comparing signed and unsigned values
* (ANSI c++ complaint); added a couple of 'const' qualifiers;
* - changed few comments, new references to some other
* implementations added to the README file;
* - it appears the Artistic License and its variant the Frontier
* Artistic License are incompatible with GPL and precludes
* this work to be included with GPL-licensed work. This was
* not my intention. The fact that this package is dual licensed
* comes to the rescue. Changed the credits[] string, and
* TERMS AND CONDITIONS to explicitly say so, stressing
* the fact that this work is dual licensed.
*/
#include "config.h"
@@ -194,7 +228,6 @@
* (and portable_vsnprintf).
*/
/* #define HAVE_SNPRINTF */
/* defined from config.h */
/* Define PREFER_PORTABLE_SNPRINTF if your system does have snprintf and
* vsnprintf but you would prefer to use the portable routine(s) instead.
@@ -202,7 +235,7 @@
* (and portable_vsnprintf) and a macro 'snprintf' (and 'vsnprintf')
* is defined to expand to 'portable_v?snprintf' - see file snprintf.h .
* Defining this macro is only useful if HAVE_SNPRINTF is also defined,
* but does does no harm if defined nevertheless.
* but does no harm if defined nevertheless.
*/
/* #define PREFER_PORTABLE_SNPRINTF */
@@ -240,14 +273,14 @@
* I don't know of any other standard and portable way of achieving the same.
* With some versions of gcc you may use __va_copy(). You might even get away
* with "ap2 = ap", in this case you must not call va_end(ap2) !
* #define va_copy(ap2,ap) ap2 = ap
* #define va_copy(ap2,ap) __va_copy((ap2),(ap))
* #define va_copy(ap2,ap) (ap2) = (ap)
*/
/* #define NEED_ASPRINTF */
/* #define NEED_ASNPRINTF */
/* #define NEED_VASPRINTF */
/* #define NEED_VASNPRINTF */
/* Define the following macros if desired:
* SOLARIS_COMPATIBLE, SOLARIS_BUG_COMPATIBLE,
* HPUX_COMPATIBLE, HPUX_BUG_COMPATIBLE, LINUX_COMPATIBLE,
@@ -287,7 +320,7 @@
/* ============================================= */
#define PORTABLE_SNPRINTF_VERSION_MAJOR 2
#define PORTABLE_SNPRINTF_VERSION_MINOR 2
#define PORTABLE_SNPRINTF_VERSION_MINOR 3
#if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
# if defined(NEED_SNPRINTF_ONLY)
@@ -319,6 +352,7 @@
#endif
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
@@ -326,11 +360,6 @@
#include <assert.h>
#include <errno.h>
#ifdef isdigit
#undef isdigit
#endif
#define isdigit(c) ((c) >= '0' && (c) <= '9')
/* For copying strings longer or equal to 'breakeven_point'
* it is more efficient to call memcpy() than to do it inline.
* The value depends mostly on the processor architecture,
@@ -339,13 +368,14 @@
* will be just fine if you don't care to squeeze every drop
* of performance out of the code.
*
* Small values favor memcpy, large values favor inline code.
* Small values favour memcpy & memset (extra procedure call, less code),
* large values favour inline code (saves procedure call, more code).
*/
#if defined(__alpha__) || defined(__alpha)
# define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
# define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc */
#endif
#if defined(__i386__) || defined(__i386)
# define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
# define breakeven_point 15 /* Intel Pentium/Linux - gcc 2.96 (12..30) */
#endif
#if defined(__hppa)
# define breakeven_point 10 /* HP-PA - gcc */
@@ -355,8 +385,8 @@
#endif
/* some other values of possible interest: */
/* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
/* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
/* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
/* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
#ifndef breakeven_point
# define breakeven_point 6 /* some reasonable one-size-fits-all value */
@@ -365,17 +395,58 @@
#define fast_memcpy(d,s,n) \
{ register size_t nn = (size_t)(n); \
if (nn >= breakeven_point) memcpy((d), (s), nn); \
else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
else if (nn > 0) { /* call overhead is worth only for large strings*/ \
register char *dd; register const char *ss; \
for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
#define fast_memset(d,c,n) \
{ register size_t nn = (size_t)(n); \
if (nn >= breakeven_point) memset((d), (int)(c), nn); \
else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
else if (nn > 0) { /* call overhead is worth only for large strings*/ \
register char *dd; register const int cc=(int)(c); \
for (dd=(d); nn>0; nn--) *dd++ = cc; } }
/* The following isdigit() is not portable (e.g. may not work
* with non-ASCII character sets). Use the system-provided isdigit()
* if available, otherwise uncomment:
* #define isdigit(c) ((c) >= '0' && (c) <= '9')
*/
/* atosizet converts a span of decimal digits to a number of type size_t.
* It is a macro, similar to: (but not quite, p will be modified!)
* void atosizet(const char *p, const char **endp, size_t *result);
* endp will point to just beyond the digits substring.
* This is _not_ a general-purpose macro:
* - the first argument will be modified;
* - the first character must already be checked to be a digit!
* NOTE: size_t could be wider than unsigned int;
* but we treat numeric string like common implementations do!
* If character set is ASCII (checking with a quick and simple-minded test)
* we convert string to a number inline for speed, otherwise we call strtoul.
*/
#define atosizet(p, endp, result) \
if ((int)'0' == 48) { /* a compile-time constant expression, */ \
/* hoping the code from one branch */ \
/* will be optimized away */ \
/* looks like ASCII character set, let's hope it really is */ \
register unsigned int uj = (unsigned int)(*(p)++ - '0'); \
while (isdigit((int)(*(p)))) \
uj = 10*uj + (unsigned int)(*(p)++ - '0'); \
if ((endp) != NULL) *(endp) = (p); \
*(result) = (size_t) uj; \
} else { \
/* non-ASCII character set, play by the rules */ \
char *ep; /* NOTE: no 'const' to make strtoul happy! */ \
/* NOTE: clip (unsigned long) to (unsigned int) as is common !!! */ \
const unsigned int uj = (unsigned int) strtoul((p), &ep, 10); \
/* The following assignment is legal: the address of a non-const */ \
/* object can be assigned to a pointer to a const object, but */ \
/* that pointer cannot be used to alter the value of the object. */ \
if ((endp) != NULL) *(endp) = ep; \
/* if num too large the result will be ULONG_MAX and errno=ERANGE */ \
*(result) = (size_t) uj; \
} \
/* prototypes */
#if defined(NEED_ASPRINTF)
@@ -411,12 +482,10 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
/* declarations */
static char credits[] = "\n\
@(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
@(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
@(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
/* avoid not used warning */
inline const char* get_credits_snprintf(const char* dummy) { return credits; }
static const char credits[] = "\n\
@(#)snprintf.c, v2.3: Mark Martinec, <mark.martinec@ijs.si>\n\
@(#)snprintf.c, v2.3: Copyright 1999-2002 Mark Martinec. Dual licensed: Frontier Artistic License or GNU General Public License applies.\n\
@(#)snprintf.c, v2.3: http://www.ijs.si/software/snprintf/\n";
#if defined(NEED_ASPRINTF)
int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
@@ -457,7 +526,7 @@ int vasprintf(char **ptr, const char *fmt, va_list ap) {
*ptr = (char *) malloc(str_m = (size_t)str_l + 1);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
const int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
assert(str_l2 == str_l);
}
return str_l;
@@ -465,7 +534,7 @@ int vasprintf(char **ptr, const char *fmt, va_list ap) {
#endif
#if defined(NEED_ASNPRINTF)
int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
int asnprintf(char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
va_list ap;
int str_l;
@@ -493,7 +562,7 @@ int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
#endif
#if defined(NEED_VASNPRINTF)
int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
int vasnprintf(char **ptr, size_t str_m, const char *fmt, va_list ap) {
int str_l;
*ptr = NULL;
@@ -510,7 +579,7 @@ int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
*ptr = (char *) malloc(str_m);
if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
else {
int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
const int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
assert(str_l2 == str_l);
}
}
@@ -548,7 +617,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
size_t str_l = 0;
const char *p = fmt;
/* In contrast with POSIX, the ISO C99 now says
/* In contrast to POSIX, the ISO C99 now says
* that str can be NULL and str_m can be 0.
* This is more useful than the old: if (str_m < 1) return -1; */
@@ -558,16 +627,21 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
if (!p) p = "";
while (*p) {
if (*p != '%') {
/* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
/* but the following code achieves better performance for cases
* where format string is long and contains few conversions */
const char *q = strchr(p+1,'%');
size_t n = !q ? strlen(p) : (q-p);
if (str_l < str_m) {
size_t avail = str_m-str_l;
fast_memcpy(str+str_l, p, (n>avail?avail:n));
if (0) { /* compile time decision between two equivalent alternatives */
/* this is simple but slow */
if (str_l < str_m) str[str_l] = *p;
p++; str_l++;
} else {
/* this usually achieves much better performance for cases
* where format string is long and contains few conversions */
const char *const q = strchr(p+1,'%');
const size_t n = !q ? strlen(p) : (q-p);
if (str_l < str_m) {
const size_t avail = str_m-str_l;
fast_memcpy(str+str_l, p, (n>avail?avail:n));
}
p += n; str_l += n;
}
p += n; str_l += n;
} else {
const char *starting_p;
size_t min_field_width = 0, precision = 0;
@@ -576,7 +650,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
the ' ' flag should be ignored. */
char length_modifier = '\0'; /* allowed values: \0, h, l, L */
char tmp[32];/* temporary buffer for simple numeric->string conversion */
char tmp[48];/* temporary buffer for simple numeric->string conversion */
const char *str_arg; /* string address in case of string argument */
size_t str_arg_l; /* natural field width of arg without padding
@@ -618,26 +692,22 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
}
p++;
}
/* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
/* If flags '0' and '-' both appear, the '0' flag should be ignored. */
/* parse field width */
if (*p == '*') {
int j;
p++; j = va_arg(ap, int);
const int j = va_arg(ap, int);
p++;
if (j >= 0) min_field_width = j;
else { min_field_width = -j; justify_left = 1; }
} else if (isdigit((int)(*p))) {
/* size_t could be wider than unsigned int;
make sure we treat argument like common implementations do */
unsigned int uj = *p++ - '0';
while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
min_field_width = uj;
atosizet(p, &p, &min_field_width);
}
/* parse precision */
if (*p == '.') {
p++; precision_specified = 1;
if (*p == '*') {
int j = va_arg(ap, int);
const int j = va_arg(ap, int);
p++;
if (j >= 0) precision = j;
else {
@@ -650,21 +720,17 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
*/
}
} else if (isdigit((int)(*p))) {
/* size_t could be wider than unsigned int;
make sure we treat argument like common implementations do */
unsigned int uj = *p++ - '0';
while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
precision = uj;
atosizet(p, &p, &precision);
}
}
/* parse 'h', 'l' and 'll' length modifiers */
if (*p == 'h' || *p == 'l') {
length_modifier = *p; p++;
if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
if (length_modifier == 'l' && *p == 'l') { /* double el = long long */
#ifdef SNPRINTF_LONGLONG_SUPPORT
length_modifier = '2'; /* double l encoded as '2' */
length_modifier = '2'; /* double letter el encoded as '2' */
#else
length_modifier = 'l'; /* treat it as a single 'l' */
length_modifier = 'l'; /* treat it as a single 'l' (letter el) */
#endif
p++;
}
@@ -695,7 +761,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
case '%':
str_arg = p; break;
case 'c': {
int j = va_arg(ap, int);
const int j = va_arg(ap, int);
uchar_arg = (unsigned char) j; /* standard demands unsigned char */
str_arg = (const char *) &uchar_arg;
break;
@@ -709,7 +775,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
else if (precision == 0) str_arg_l = 0;
else {
/* memchr on HP does not like n > 2^31 !!! */
const char *q = memchr(str_arg, '\0',
const char *const q = (const char *) memchr(str_arg, '\0',
precision <= 0x7fffffff ? precision : 0x7fffffff);
str_arg_l = !q ? precision : (q-str_arg);
}
@@ -730,15 +796,15 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
/* only defined for length modifier h, or for no length modifiers */
long int long_arg = 0; unsigned long int ulong_arg = 0;
/* only defined for length modifier l */
/* only defined for length modifier l (letter el) */
void *ptr_arg = NULL;
/* pointer argument value -only defined for p conversion */
/* pointer argument value - only defined for p conversion */
#ifdef SNPRINTF_LONGLONG_SUPPORT
long long int long_long_arg = 0;
unsigned long long int ulong_long_arg = 0;
/* only defined for length modifier ll */
/* only defined for length modifier ll (double letter el) */
#endif
if (fmt_spec == 'p') {
/* HPUX 10: An l, h, ll or L before any other conversion character
@@ -766,7 +832,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
switch (length_modifier) {
case '\0':
case 'h':
/* It is non-portable to specify a second argument of char or short
/* It is non-portable to specify char or short as the second argument
* to va_arg, because arguments seen by the called function
* are not char or short. C converts char and short arguments
* to int before passing them to a function.
@@ -775,7 +841,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
if (int_arg > 0) arg_sign = 1;
else if (int_arg < 0) arg_sign = -1;
break;
case 'l':
case 'l': /* letter el */
long_arg = va_arg(ap, long int);
if (long_arg > 0) arg_sign = 1;
else if (long_arg < 0) arg_sign = -1;
@@ -795,7 +861,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
uint_arg = va_arg(ap, unsigned int);
if (uint_arg) arg_sign = 1;
break;
case 'l':
case 'l': /* letter el */
ulong_arg = va_arg(ap, unsigned long int);
if (ulong_arg) arg_sign = 1;
break;
@@ -854,32 +920,46 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
/* When zero value is formatted with an explicit precision 0,
the resulting formatted string is empty (d, i, u, o, x, X, p). */
} else {
char f[5]; int f_l = 0;
static int sprintf_return_value_is_ansi_compliant = -1; /* unknown */
char f[5]; int f_l = 0, sprintf_l = 0;
f[f_l++] = '%'; /* construct a simple format string for sprintf */
if (!length_modifier) { }
else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
else f[f_l++] = length_modifier;
f[f_l++] = fmt_spec; f[f_l++] = '\0';
if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
if (sprintf_return_value_is_ansi_compliant < 0) { /* not yet known */
/* let's do a little run-time experiment (only once) to see if the
* native sprintf returns a string length as required by ANSI, or has
* some other ideas like the old SunOS which returns buffer address */
sprintf_return_value_is_ansi_compliant =
(sprintf(tmp+str_arg_l, "%d", 19) == 2);
}
if (fmt_spec == 'p') sprintf_l=sprintf(tmp+str_arg_l, f, ptr_arg);
else if (fmt_spec == 'd') { /* signed */
switch (length_modifier) {
case '\0':
case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
case 'h': sprintf_l=sprintf(tmp+str_arg_l, f, int_arg); break;
case 'l': sprintf_l=sprintf(tmp+str_arg_l, f, long_arg); break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
case '2': sprintf_l=sprintf(tmp+str_arg_l,f,long_long_arg); break;
#endif
}
} else { /* unsigned */
switch (length_modifier) {
case '\0':
case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
case 'h': sprintf_l=sprintf(tmp+str_arg_l, f, uint_arg); break;
case 'l': sprintf_l=sprintf(tmp+str_arg_l, f, ulong_arg); break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
case '2': sprintf_l=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
#endif
}
}
if (!sprintf_return_value_is_ansi_compliant) { /* broken sprintf? */
tmp[sizeof(tmp)-1] = '\0'; sprintf_l = strlen(tmp+str_arg_l);
}
assert(sprintf_l >= 0); /* should not happen; problem in sprintf? */
assert(sprintf_l+str_arg_l < sizeof(tmp)); /*better late then never*/
str_arg_l += sprintf_l;
/* include the optional minus sign and possible "0x"
in the region before the zero padding insertion point */
if (zero_padding_insertion_ind < str_arg_l &&
@@ -893,7 +973,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
zero_padding_insertion_ind += 2;
}
}
{ size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
{ const size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
if (alternate_form && fmt_spec == 'o'
#ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
&& (str_arg_l > 0)
@@ -918,11 +998,29 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
}
/* zero padding to specified minimal field width? */
if (!justify_left && zero_padding) {
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
const int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
if (n > 0) number_of_zeros_to_pad += n;
}
break;
}
case 'n': {
void *const ptr = va_arg(ap, void *);
if (ptr != NULL) {
/* same problem of size_t -> int type conversion as with the
* snprintf return value - see comment at the end of this procedure */
switch (length_modifier) {
case '\0': *( int *const)ptr = str_l; break;
case 'h': *(short int *const)ptr = str_l; break;
case 'l': *(long int *const)ptr = str_l; break;
#ifdef SNPRINTF_LONGLONG_SUPPORT
case '2': *(long long int *const)ptr = str_l; break;
#endif
}
}
/* no argument converted */
min_field_width = number_of_zeros_to_pad = str_arg_l = 0;
break;
}
default: /* unrecognized conversion specifier, keep format string as-is*/
zero_padding = 0; /* turn zero padding off for non-numeric convers. */
#ifndef DIGITAL_UNIX_COMPATIBLE
@@ -946,60 +1044,66 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
/* insert padding to the left as requested by min_field_width;
this does not include the zero padding in case of numerical conversions*/
if (!justify_left) { /* left padding with blank or zero */
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
const int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
if (n > 0) {
if (str_l < str_m) {
size_t avail = str_m-str_l;
fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
const size_t avail = str_m-str_l;
fast_memset(str+str_l, (zero_padding?'0':' '),
((unsigned int)n > avail ? avail : (unsigned int)n));
}
str_l += n;
}
}
/* zero padding as requested by the precision or by the minimal field width
* for numeric conversions required? */
/* is zero padding as requested by the precision or by the
* minimal field width for numeric conversions required? */
if (number_of_zeros_to_pad <= 0) {
/* will not copy first part of numeric right now, *
* force it to be copied later in its entirety */
/* will not copy the first part of numeric right now, *
* force it to be copied later in its entirety */
zero_padding_insertion_ind = 0;
} else {
/* insert first part of numerics (sign or '0x') before zero padding */
int n = zero_padding_insertion_ind;
if (n > 0) {
if (str_l < str_m) {
size_t avail = str_m-str_l;
fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
{ const int n = zero_padding_insertion_ind;
if (n > 0) {
if (str_l < str_m) {
const size_t avail = str_m-str_l;
fast_memcpy(str+str_l, str_arg,
((unsigned int)n > avail ? avail : (unsigned int)n));
}
str_l += n;
}
str_l += n;
}
/* insert zero padding as requested by the precision or min field width */
n = number_of_zeros_to_pad;
if (n > 0) {
if (str_l < str_m) {
size_t avail = str_m-str_l;
fast_memset(str+str_l, '0', (n>avail?avail:n));
{ const int n = number_of_zeros_to_pad;
if (n > 0) {
if (str_l < str_m) {
const size_t avail = str_m-str_l;
fast_memset(str+str_l, '0',
((unsigned int)n > avail ? avail : (unsigned int)n));
}
str_l += n;
}
str_l += n;
}
}
/* insert formatted string
* (or as-is conversion specifier for unknown conversions) */
{ int n = str_arg_l - zero_padding_insertion_ind;
{ const int n = str_arg_l - zero_padding_insertion_ind;
if (n > 0) {
if (str_l < str_m) {
size_t avail = str_m-str_l;
const size_t avail = str_m-str_l;
fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
(n>avail?avail:n));
((unsigned int)n > avail ? avail : (unsigned int)n));
}
str_l += n;
}
}
/* insert right padding */
if (justify_left) { /* right blank padding to the field width */
int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
const int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
if (n > 0) {
if (str_l < str_m) {
size_t avail = str_m-str_l;
fast_memset(str+str_l, ' ', (n>avail?avail:n));
const size_t avail = str_m-str_l;
fast_memset(str+str_l, ' ',
((unsigned int)n > avail ? avail : (unsigned int)n));
}
str_l += n;
}
@@ -1009,9 +1113,8 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
#if defined(NEED_SNPRINTF_ONLY)
va_end(ap);
#endif
if (str_m > 0) { /* make sure the string is null-terminated
even at the expense of overwriting the last character
(shouldn't happen, but just in case) */
if (str_m > 0) { /* make sure the string is null-terminated, possibly
at the expense of overwriting the last character */
str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
}
/* Return the number of characters formatted (excluding trailing null
@@ -1020,7 +1123,7 @@ int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
*
* The value of str_l should be returned, but str_l is of unsigned type
* size_t, and snprintf is int, possibly leading to an undetected
* integer overflow, resulting in a negative return value, which is illegal.
* integer overflow, resulting in a negative return value, which is invalid.
* Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
* Should errno be set to EOVERFLOW and EOF returned in this case???
*/