mirror of git://anongit.mindrot.org/openssh.git
653 lines
16 KiB
C
653 lines
16 KiB
C
/*
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* Copyright Patrick Powell 1995
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* This code is based on code written by Patrick Powell (papowell@astart.com)
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* It may be used for any purpose as long as this notice remains intact
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* on all source code distributions
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*/
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/**************************************************************
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* Original:
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* Patrick Powell Tue Apr 11 09:48:21 PDT 1995
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* A bombproof version of doprnt (dopr) included.
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* Sigh. This sort of thing is always nasty do deal with. Note that
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* the version here does not include floating point...
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*
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* snprintf() is used instead of sprintf() as it does limit checks
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* for string length. This covers a nasty loophole.
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*
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* The other functions are there to prevent NULL pointers from
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* causing nast effects.
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*
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* More Recently:
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* Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
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* This was ugly. It is still ugly. I opted out of floating point
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* numbers, but the formatter understands just about everything
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* from the normal C string format, at least as far as I can tell from
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* the Solaris 2.5 printf(3S) man page.
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*
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* Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
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* Ok, added some minimal floating point support, which means this
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* probably requires libm on most operating systems. Don't yet
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* support the exponent (e,E) and sigfig (g,G). Also, fmtint()
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* was pretty badly broken, it just wasn't being exercised in ways
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* which showed it, so that's been fixed. Also, formated the code
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* to mutt conventions, and removed dead code left over from the
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* original. Also, there is now a builtin-test, just compile with:
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* gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
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* and run snprintf for results.
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*
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* Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
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* The PGP code was using unsigned hexadecimal formats.
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* Unfortunately, unsigned formats simply didn't work.
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*
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* Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
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* The original code assumed that both snprintf() and vsnprintf() were
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* missing. Some systems only have snprintf() but not vsnprintf(), so
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* the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
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*
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* Ben Lindstrom <mouring@eviladmin.org> 09/27/00 for OpenSSH
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* Welcome to the world of %lld and %qd support. With other
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* long long support. This is needed for sftp-server to work
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* right.
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*
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* Ben Lindstrom <mouring@eviladmin.org> 02/12/01 for OpenSSH
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* Removed all hint of VARARGS stuff and banished it to the void,
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* and did a bit of KNF style work to make things a bit more
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* acceptable. Consider stealing from mutt or enlightenment.
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**************************************************************/
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#include "includes.h"
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RCSID("$Id: bsd-snprintf.c,v 1.7 2003/05/18 14:13:39 djm Exp $");
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#if defined(BROKEN_SNPRINTF) /* For those with broken snprintf() */
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# undef HAVE_SNPRINTF
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# undef HAVE_VSNPRINTF
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#endif
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#if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
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static void
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dopr(char *buffer, size_t maxlen, const char *format, va_list args);
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static void
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fmtstr(char *buffer, size_t *currlen, size_t maxlen, char *value, int flags,
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int min, int max);
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static void
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fmtint(char *buffer, size_t *currlen, size_t maxlen, long value, int base,
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int min, int max, int flags);
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static void
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fmtfp(char *buffer, size_t *currlen, size_t maxlen, long double fvalue,
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int min, int max, int flags);
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static void
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dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
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/*
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* dopr(): poor man's version of doprintf
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*/
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/* format read states */
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#define DP_S_DEFAULT 0
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#define DP_S_FLAGS 1
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#define DP_S_MIN 2
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#define DP_S_DOT 3
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#define DP_S_MAX 4
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#define DP_S_MOD 5
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#define DP_S_CONV 6
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#define DP_S_DONE 7
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/* format flags - Bits */
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#define DP_F_MINUS (1 << 0)
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#define DP_F_PLUS (1 << 1)
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#define DP_F_SPACE (1 << 2)
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#define DP_F_NUM (1 << 3)
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#define DP_F_ZERO (1 << 4)
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#define DP_F_UP (1 << 5)
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#define DP_F_UNSIGNED (1 << 6)
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/* Conversion Flags */
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#define DP_C_SHORT 1
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#define DP_C_LONG 2
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#define DP_C_LDOUBLE 3
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#define DP_C_LONG_LONG 4
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#define char_to_int(p) (p - '0')
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#define abs_val(p) (p < 0 ? -p : p)
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static void
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dopr(char *buffer, size_t maxlen, const char *format, va_list args)
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{
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char *strvalue, ch;
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long value;
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long double fvalue;
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int min = 0, max = -1, state = DP_S_DEFAULT, flags = 0, cflags = 0;
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size_t currlen = 0;
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ch = *format++;
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while (state != DP_S_DONE) {
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if ((ch == '\0') || (currlen >= maxlen))
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state = DP_S_DONE;
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switch(state) {
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case DP_S_DEFAULT:
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if (ch == '%')
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state = DP_S_FLAGS;
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else
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dopr_outch(buffer, &currlen, maxlen, ch);
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ch = *format++;
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break;
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case DP_S_FLAGS:
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switch (ch) {
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case '-':
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flags |= DP_F_MINUS;
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ch = *format++;
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break;
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case '+':
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flags |= DP_F_PLUS;
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ch = *format++;
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break;
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case ' ':
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flags |= DP_F_SPACE;
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ch = *format++;
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break;
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case '#':
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flags |= DP_F_NUM;
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ch = *format++;
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break;
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case '0':
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flags |= DP_F_ZERO;
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ch = *format++;
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break;
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default:
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state = DP_S_MIN;
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break;
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}
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break;
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case DP_S_MIN:
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if (isdigit((unsigned char)ch)) {
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min = 10 * min + char_to_int (ch);
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ch = *format++;
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} else if (ch == '*') {
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min = va_arg (args, int);
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ch = *format++;
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state = DP_S_DOT;
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} else
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state = DP_S_DOT;
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break;
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case DP_S_DOT:
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if (ch == '.') {
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state = DP_S_MAX;
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ch = *format++;
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} else
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state = DP_S_MOD;
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break;
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case DP_S_MAX:
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if (isdigit((unsigned char)ch)) {
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if (max < 0)
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max = 0;
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max = 10 * max + char_to_int(ch);
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ch = *format++;
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} else if (ch == '*') {
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max = va_arg (args, int);
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ch = *format++;
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state = DP_S_MOD;
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} else
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state = DP_S_MOD;
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break;
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case DP_S_MOD:
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switch (ch) {
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case 'h':
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cflags = DP_C_SHORT;
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ch = *format++;
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break;
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case 'l':
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cflags = DP_C_LONG;
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ch = *format++;
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if (ch == 'l') {
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cflags = DP_C_LONG_LONG;
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ch = *format++;
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}
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break;
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case 'q':
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cflags = DP_C_LONG_LONG;
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ch = *format++;
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break;
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case 'L':
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cflags = DP_C_LDOUBLE;
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ch = *format++;
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break;
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default:
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break;
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}
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state = DP_S_CONV;
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break;
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case DP_S_CONV:
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switch (ch) {
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case 'd':
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case 'i':
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if (cflags == DP_C_SHORT)
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value = va_arg(args, int);
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else if (cflags == DP_C_LONG)
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value = va_arg(args, long int);
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else if (cflags == DP_C_LONG_LONG)
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value = va_arg (args, long long);
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else
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value = va_arg (args, int);
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fmtint(buffer, &currlen, maxlen, value, 10, min, max, flags);
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break;
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case 'o':
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flags |= DP_F_UNSIGNED;
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if (cflags == DP_C_SHORT)
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value = va_arg(args, unsigned int);
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else if (cflags == DP_C_LONG)
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value = va_arg(args, unsigned long int);
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else if (cflags == DP_C_LONG_LONG)
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value = va_arg(args, unsigned long long);
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else
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value = va_arg(args, unsigned int);
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fmtint(buffer, &currlen, maxlen, value, 8, min, max, flags);
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break;
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case 'u':
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flags |= DP_F_UNSIGNED;
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if (cflags == DP_C_SHORT)
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value = va_arg(args, unsigned int);
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else if (cflags == DP_C_LONG)
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value = va_arg(args, unsigned long int);
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else if (cflags == DP_C_LONG_LONG)
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value = va_arg(args, unsigned long long);
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else
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value = va_arg(args, unsigned int);
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fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
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break;
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case 'X':
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flags |= DP_F_UP;
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case 'x':
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flags |= DP_F_UNSIGNED;
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if (cflags == DP_C_SHORT)
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value = va_arg(args, unsigned int);
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else if (cflags == DP_C_LONG)
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value = va_arg(args, unsigned long int);
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else if (cflags == DP_C_LONG_LONG)
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value = va_arg(args, unsigned long long);
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else
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value = va_arg(args, unsigned int);
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fmtint(buffer, &currlen, maxlen, value, 16, min, max, flags);
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break;
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case 'f':
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if (cflags == DP_C_LDOUBLE)
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fvalue = va_arg(args, long double);
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else
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fvalue = va_arg(args, double);
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/* um, floating point? */
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fmtfp(buffer, &currlen, maxlen, fvalue, min, max, flags);
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break;
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case 'E':
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flags |= DP_F_UP;
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case 'e':
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if (cflags == DP_C_LDOUBLE)
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fvalue = va_arg(args, long double);
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else
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fvalue = va_arg(args, double);
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break;
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case 'G':
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flags |= DP_F_UP;
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case 'g':
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if (cflags == DP_C_LDOUBLE)
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fvalue = va_arg(args, long double);
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else
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fvalue = va_arg(args, double);
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break;
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case 'c':
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dopr_outch(buffer, &currlen, maxlen, va_arg(args, int));
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break;
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case 's':
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strvalue = va_arg(args, char *);
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if (max < 0)
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max = maxlen; /* ie, no max */
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fmtstr(buffer, &currlen, maxlen, strvalue, flags, min, max);
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break;
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case 'p':
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strvalue = va_arg(args, void *);
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fmtint(buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
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break;
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case 'n':
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if (cflags == DP_C_SHORT) {
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short int *num;
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num = va_arg(args, short int *);
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*num = currlen;
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} else if (cflags == DP_C_LONG) {
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long int *num;
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num = va_arg(args, long int *);
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*num = currlen;
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} else if (cflags == DP_C_LONG_LONG) {
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long long *num;
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num = va_arg(args, long long *);
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*num = currlen;
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} else {
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int *num;
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num = va_arg(args, int *);
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*num = currlen;
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}
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break;
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case '%':
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dopr_outch(buffer, &currlen, maxlen, ch);
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break;
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case 'w': /* not supported yet, treat as next char */
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ch = *format++;
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break;
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default: /* Unknown, skip */
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break;
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}
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ch = *format++;
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state = DP_S_DEFAULT;
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flags = cflags = min = 0;
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max = -1;
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break;
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case DP_S_DONE:
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break;
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default: /* hmm? */
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break; /* some picky compilers need this */
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}
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}
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if (currlen < maxlen - 1)
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buffer[currlen] = '\0';
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else
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buffer[maxlen - 1] = '\0';
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}
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static void
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fmtstr(char *buffer, size_t *currlen, size_t maxlen,
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char *value, int flags, int min, int max)
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{
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int cnt = 0, padlen, strln; /* amount to pad */
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if (value == 0)
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value = "<NULL>";
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for (strln = 0; value[strln]; ++strln); /* strlen */
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padlen = min - strln;
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if (padlen < 0)
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padlen = 0;
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if (flags & DP_F_MINUS)
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padlen = -padlen; /* Left Justify */
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while ((padlen > 0) && (cnt < max)) {
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dopr_outch(buffer, currlen, maxlen, ' ');
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--padlen;
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++cnt;
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}
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while (*value && (cnt < max)) {
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dopr_outch(buffer, currlen, maxlen, *value++);
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++cnt;
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}
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while ((padlen < 0) && (cnt < max)) {
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dopr_outch(buffer, currlen, maxlen, ' ');
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++padlen;
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++cnt;
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}
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}
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/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
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static void
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fmtint(char *buffer, size_t *currlen, size_t maxlen,
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long value, int base, int min, int max, int flags)
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{
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unsigned long uvalue;
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char convert[20];
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int signvalue = 0, place = 0, caps = 0;
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int spadlen = 0; /* amount to space pad */
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int zpadlen = 0; /* amount to zero pad */
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if (max < 0)
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max = 0;
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uvalue = value;
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if (!(flags & DP_F_UNSIGNED)) {
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if (value < 0) {
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signvalue = '-';
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uvalue = -value;
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} else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
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signvalue = '+';
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else if (flags & DP_F_SPACE)
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signvalue = ' ';
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}
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if (flags & DP_F_UP)
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caps = 1; /* Should characters be upper case? */
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do {
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convert[place++] =
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(caps ? "0123456789ABCDEF" : "0123456789abcdef")
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[uvalue % (unsigned)base];
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uvalue = (uvalue / (unsigned)base );
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} while (uvalue && (place < 20));
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if (place == 20)
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place--;
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convert[place] = 0;
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zpadlen = max - place;
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spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
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if (zpadlen < 0)
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zpadlen = 0;
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if (spadlen < 0)
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spadlen = 0;
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if (flags & DP_F_ZERO) {
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zpadlen = MAX(zpadlen, spadlen);
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spadlen = 0;
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}
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if (flags & DP_F_MINUS)
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spadlen = -spadlen; /* Left Justifty */
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/* Spaces */
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while (spadlen > 0) {
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dopr_outch(buffer, currlen, maxlen, ' ');
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--spadlen;
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}
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/* Sign */
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if (signvalue)
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dopr_outch(buffer, currlen, maxlen, signvalue);
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/* Zeros */
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if (zpadlen > 0) {
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while (zpadlen > 0) {
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dopr_outch(buffer, currlen, maxlen, '0');
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--zpadlen;
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}
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}
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/* Digits */
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while (place > 0)
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dopr_outch(buffer, currlen, maxlen, convert[--place]);
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/* Left Justified spaces */
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while (spadlen < 0) {
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dopr_outch (buffer, currlen, maxlen, ' ');
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++spadlen;
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}
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}
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static long double
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pow10(int exp)
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{
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long double result = 1;
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while (exp) {
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result *= 10;
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exp--;
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}
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return result;
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}
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static long
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round(long double value)
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{
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long intpart = value;
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value -= intpart;
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if (value >= 0.5)
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intpart++;
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return intpart;
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}
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static void
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fmtfp(char *buffer, size_t *currlen, size_t maxlen, long double fvalue,
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int min, int max, int flags)
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{
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char iconvert[20], fconvert[20];
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int signvalue = 0, iplace = 0, fplace = 0;
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int padlen = 0; /* amount to pad */
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int zpadlen = 0, caps = 0;
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long intpart, fracpart;
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long double ufvalue;
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/*
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* AIX manpage says the default is 0, but Solaris says the default
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* is 6, and sprintf on AIX defaults to 6
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*/
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if (max < 0)
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max = 6;
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ufvalue = abs_val(fvalue);
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if (fvalue < 0)
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signvalue = '-';
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else if (flags & DP_F_PLUS) /* Do a sign (+/i) */
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signvalue = '+';
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else if (flags & DP_F_SPACE)
|
|
signvalue = ' ';
|
|
|
|
intpart = ufvalue;
|
|
|
|
/*
|
|
* Sorry, we only support 9 digits past the decimal because of our
|
|
* conversion method
|
|
*/
|
|
if (max > 9)
|
|
max = 9;
|
|
|
|
/* We "cheat" by converting the fractional part to integer by
|
|
* multiplying by a factor of 10
|
|
*/
|
|
fracpart = round((pow10 (max)) * (ufvalue - intpart));
|
|
|
|
if (fracpart >= pow10 (max)) {
|
|
intpart++;
|
|
fracpart -= pow10 (max);
|
|
}
|
|
|
|
/* Convert integer part */
|
|
do {
|
|
iconvert[iplace++] =
|
|
(caps ? "0123456789ABCDEF" : "0123456789abcdef")
|
|
[intpart % 10];
|
|
intpart = (intpart / 10);
|
|
} while(intpart && (iplace < 20));
|
|
if (iplace == 20)
|
|
iplace--;
|
|
iconvert[iplace] = 0;
|
|
|
|
/* Convert fractional part */
|
|
do {
|
|
fconvert[fplace++] =
|
|
(caps ? "0123456789ABCDEF" : "0123456789abcdef")
|
|
[fracpart % 10];
|
|
fracpart = (fracpart / 10);
|
|
} while(fracpart && (fplace < 20));
|
|
if (fplace == 20)
|
|
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]);
|
|
|
|
/*
|
|
* Decimal point. This should probably use locale to find the
|
|
* correct char to print out.
|
|
*/
|
|
dopr_outch(buffer, currlen, maxlen, '.');
|
|
|
|
while (fplace > 0)
|
|
dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
|
|
|
|
while (zpadlen > 0) {
|
|
dopr_outch(buffer, currlen, maxlen, '0');
|
|
--zpadlen;
|
|
}
|
|
|
|
while (padlen < 0) {
|
|
dopr_outch(buffer, currlen, maxlen, ' ');
|
|
++padlen;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
|
|
{
|
|
if (*currlen < maxlen)
|
|
buffer[(*currlen)++] = c;
|
|
}
|
|
#endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
|
|
|
|
#ifndef HAVE_VSNPRINTF
|
|
int
|
|
vsnprintf(char *str, size_t count, const char *fmt, va_list args)
|
|
{
|
|
str[0] = 0;
|
|
dopr(str, count, fmt, args);
|
|
|
|
return(strlen(str));
|
|
}
|
|
#endif /* !HAVE_VSNPRINTF */
|
|
|
|
#ifndef HAVE_SNPRINTF
|
|
int
|
|
snprintf(char *str,size_t count,const char *fmt,...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
(void) vsnprintf(str, count, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return(strlen(str));
|
|
}
|
|
|
|
#endif /* !HAVE_SNPRINTF */
|