print.c revision 9c3531d72aeaad6c5f01efe6a1c82023e1379e4d
/*
* Copyright (C) 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* $Id: print.c,v 1.11 2000/06/22 21:57:06 tale Exp $ */
#include <config.h>
#include <ctype.h>
#include <stdio.h> /* for sprintf */
#include <stdlib.h>
#include <isc/assertions.h>
#include <isc/print.h>
#include <isc/platform.h>
#include <isc/util.h>
#ifndef ISC_PLATFORM_NEEDVSNPRINTF
#error ISC_PLATFORM_NEEDVSPRINTF needs to be defined to compile this file.
#endif
/*
* Return length of string that would have been written if not truncated.
*/
int
isc_print_snprintf(char *str, size_t size, const char *format, ...) {
va_list ap;
int ret;
va_start(ap, format);
ret = vsnprintf(str, size, format, ap);
va_end(ap);
return (ret);
}
/*
* Return length of string that would have been written if not truncated.
*/
int
isc_print_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
int h;
int l;
int q;
int alt;
int zero;
int left;
int plus;
int space;
int neg;
long long tmpi;
unsigned long long tmpui;
unsigned long width;
unsigned long precision;
unsigned int length;
char buf[1024];
char *cp;
char *save = str;
char c;
void *v;
char *head;
int count = 0;
int pad;
int zeropad;
int dot;
double dbl;
#ifdef HAVE_LONG_DOUBLE
long double ldbl;
#endif
char fmt[32];
INSIST(str != NULL);
INSIST(format != NULL);
while (*format != '\0') {
if (*format != '%') {
if (size > 1) {
*str++ = *format;
size--;
}
count++;
format++;
continue;
}
format++;
/*
* Reset flags.
*/
dot = neg = space = plus = left = zero = alt = h = l = q = 0;
width = precision = 0;
head = "";
length = pad = zeropad = 0;
do {
if (*format == '#') {
alt = 1;
format++;
} else if (*format == '-') {
left = 1;
zero = 0;
format++;
} else if (*format == ' ') {
if (!plus)
space = 1;
format++;
} else if (*format == '+') {
plus = 1;
space = 0;
format++;
} else if (*format == '0') {
if (!left)
zero = 1;
format++;
} else
break;
} while (1);
/*
* Width.
*/
if (*format == '*') {
width = va_arg(ap, int);
format++;
} else if (isdigit((unsigned char)*format)) {
char *e;
width = strtoul(format, &e, 10);
format = e;
}
/*
* Precision.
*/
if (*format == '.') {
format++;
dot = 1;
if (*format == '*') {
precision = va_arg(ap, int);
format++;
} else if (isdigit((unsigned char)*format)) {
char *e;
precision = strtoul(format, &e, 10);
format = e;
}
}
switch (*format) {
case '\0':
continue;
case '%':
if (size > 1) {
*str++ = *format;
size--;
}
format++;
count++;
break;
case 'q':
q = 1;
format++;
goto doint;
case 'h':
h = 1;
format++;
goto doint;
case 'l':
l = 1;
format++;
if (*format == 'l')
q = 1;
goto doint;
case 'n':
case 'i':
case 'd':
case 'o':
case 'u':
case 'x':
case 'X':
doint:
if (precision != 0)
zero = 0;
switch (*format) {
case 'n':
if (h) {
short int *p;
p = va_arg(ap, short *);
REQUIRE(p != NULL);
*p = str - save;
} else if (l) {
long int *p;
p = va_arg(ap, long *);
REQUIRE(p != NULL);
*p = str - save;
} else {
int *p;
p = va_arg(ap, int *);
REQUIRE(p != NULL);
*p = str - save;
}
break;
case 'i':
case 'd':
if (q)
tmpi = va_arg(ap, long long);
else if (l)
tmpi = va_arg(ap, long int);
else
tmpi = va_arg(ap, int);
if (tmpi < 0) {
head = "-";
tmpui = -tmpi;
} else {
if (plus)
head = "+";
else if (space)
head = " ";
else
head = "";
tmpui = tmpi;
}
#ifdef ISC_PLATFORM_LONGLONGEQUALLONG
sprintf(buf, "%lu", tmpui);
#else
sprintf(buf, "%llu", tmpui);
#endif
goto printint;
case 'o':
if (q)
tmpui = va_arg(ap, unsigned long long);
else if (l)
tmpui = va_arg(ap, long int);
else
tmpui = va_arg(ap, int);
#ifdef ISC_PLATFORM_LONGLONGEQUALLONG
sprintf(buf, alt ? "%#lo" : "%lo", tmpui);
#else
sprintf(buf, alt ? "%#llo" : "%llo", tmpui);
#endif
goto printint;
case 'u':
if (q)
tmpui = va_arg(ap, unsigned long long);
else if (l)
tmpui = va_arg(ap, unsigned long int);
else
tmpui = va_arg(ap, unsigned int);
#ifdef ISC_PLATFORM_LONGLONGEQUALLONG
sprintf(buf, "%lu", tmpui);
#else
sprintf(buf, "%llu", tmpui);
#endif
goto printint;
case 'x':
if (q)
tmpui = va_arg(ap, unsigned long long);
else if (l)
tmpui = va_arg(ap, unsigned long int);
else
tmpui = va_arg(ap, unsigned int);
if (alt) {
head = "0x";
if (precision > 2)
precision -= 2;
}
#ifdef ISC_PLATFORM_LONGLONGEQUALLONG
sprintf(buf, "%lx", tmpui);
#else
sprintf(buf, "%llx", tmpui);
#endif
goto printint;
case 'X':
if (q)
tmpui = va_arg(ap, unsigned long long);
else if (l)
tmpui = va_arg(ap, unsigned long int);
else
tmpui = va_arg(ap, unsigned int);
if (alt) {
head = "0X";
if (precision > 2)
precision -= 2;
}
#ifdef ISC_PLATFORM_LONGLONGEQUALLONG
sprintf(buf, "%lX", tmpui);
#else
sprintf(buf, "%llX", tmpui);
#endif
goto printint;
printint:
if (precision != 0 || width != 0) {
length = strlen(buf);
if (length < precision)
zeropad = precision - length;
else if (length < width && zero)
zeropad = width - length;
if (width != 0) {
pad = width - length -
zeropad - strlen(head);
if (pad < 0)
pad = 0;
}
}
count += strlen(head) + strlen(buf) + pad +
zeropad;
if (!left) {
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
}
cp = head;
while (*cp != '\0' && size > 1) {
*str++ = *cp++;
size--;
}
while (zeropad > 0 && size > 1) {
*str++ = '0';
size--;
zeropad--;
}
cp = buf;
while (*cp != '\0' && size > 1) {
*str++ = *cp++;
size--;
}
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
break;
default:
break;
}
break;
case 's':
cp = va_arg(ap, char *);
REQUIRE(cp != NULL);
if (precision != 0) {
/*
* cp need not be NULL terminated.
*/
char *tp;
unsigned long n;
n = precision;
tp = cp;
while (n != 0 && *tp != '0')
n--, tp++;
length = precision - n;
} else {
length = strlen(cp);
}
if (width != 0) {
pad = width - length;
if (pad < 0)
pad = 0;
}
count += pad + length;
if (!left)
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
if (precision != 0)
while (precision > 0 && *cp != '\0' &&
size > 1) {
*str++ = *cp++;
size--;
precision--;
}
else
while (*cp != '\0' && size > 1) {
*str++ = *cp++;
size--;
}
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
break;
case 'c':
c = va_arg(ap, int);
if (width > 0) {
count += width;
width--;
if (left) {
*str++ = c;
size--;
}
while (width-- > 0 && size > 1) {
*str++ = ' ';
size--;
}
if (!left && size > 1) {
*str++ = c;
size--;
}
} else {
count++;
if (size > 1) {
*str++ = c;
size--;
}
}
break;
case 'p':
v = va_arg(ap, void *);
sprintf(buf, "%p", v);
length = strlen(buf);
if (precision > length)
zeropad = precision - length;
if (width > 0) {
pad = width - length - zeropad;
if (pad < 0)
pad = 0;
}
count += length + pad + zeropad;
if (!left)
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
cp = buf;
if (zeropad > 0 && buf[0] == '0' &&
(buf[1] == 'x' || buf[1] == 'X')) {
if (size > 1) {
*str++ = *cp++;
size--;
}
if (size > 1) {
*str++ = *cp++;
size--;
}
while (zeropad > 0 && size > 1) {
*str++ = '0';
size--;
zeropad--;
}
}
while (*cp != '\0' && size > 1) {
*str++ = *cp++;
size--;
}
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
break;
case 'D': /*deprecated*/
INSIST("use %ld instead of %D" == NULL);
case 'O': /*deprecated*/
INSIST("use %lo instead of %O" == NULL);
case 'U': /*deprecated*/
INSIST("use %lu instead of %U" == NULL);
case 'L':
#ifdef HAVE_LONG_DOUBLE
l = 1;
#else
INSIST("long doubles are not supported" == NULL);
#endif
/*FALLTHROUGH*/
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (!dot)
precision = 6;
/*
* IEEE floating point.
* MIN 2.2250738585072014E-308
* MAX 1.7976931348623157E+308
* VAX floating point has a smaller range than IEEE.
*
* precisions > 324 don't make much sence.
* if we cap the precision at 512 we will not
* overflow buf.
*/
if (precision > 512)
precision = 512;
sprintf(fmt, "%%%s%s.%lu%s%c", alt ? "#" : "",
plus ? "+" : space ? " " : "",
precision, l ? "L" : "", *format);
switch (*format) {
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
#ifdef HAVE_LONG_DOUBLE
if (l) {
ldbl = va_arg(ap, long double);
sprintf(buf, fmt, ldbl);
} else
#endif
{
dbl = va_arg(ap, double);
sprintf(buf, fmt, dbl);
}
length = strlen(buf);
if (width > 0) {
pad = width - length;
if (pad < 0)
pad = 0;
}
count += length + pad;
if (!left)
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
cp = buf;
while (*cp != ' ' && size > 1) {
*str++ = *cp++;
size--;
}
while (pad > 0 && size > 1) {
*str++ = ' ';
size--;
pad--;
}
break;
default:
continue;
}
break;
default:
continue;
}
format++;
}
if (size > 0)
*str = '\0';
return (count);
}