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120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/* Estimate the length of the string generated by a vprintf-like
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function. Used by vasprintf and xvasprintf.
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Copyright (C) 1994-2021 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not, write
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to the Free Software Foundation, Inc., 51 Franklin Street - Fifth
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Floor, Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <ansidecl.h>
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#include <stdarg.h>
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#if !defined (va_copy) && defined (__va_copy)
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# define va_copy(d,s) __va_copy((d),(s))
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#endif
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#else
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extern unsigned long strtoul ();
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#endif
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#include "libiberty.h"
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int
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libiberty_vprintf_buffer_size (const char *format, va_list args)
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{
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const char *p = format;
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/* Add one to make sure that it is never zero, which might cause malloc
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to return NULL. */
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int total_width = strlen (format) + 1;
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va_list ap;
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#ifdef va_copy
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va_copy (ap, args);
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#else
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memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list));
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#endif
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while (*p != '\0')
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{
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if (*p++ == '%')
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{
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while (strchr ("-+ #0", *p))
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++p;
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if (*p == '*')
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{
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++p;
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total_width += abs (va_arg (ap, int));
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}
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else
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total_width += strtoul (p, (char **) &p, 10);
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if (*p == '.')
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{
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++p;
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if (*p == '*')
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{
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++p;
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total_width += abs (va_arg (ap, int));
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}
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else
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total_width += strtoul (p, (char **) &p, 10);
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}
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while (strchr ("hlL", *p))
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++p;
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/* Should be big enough for any format specifier except %s and floats. */
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total_width += 30;
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switch (*p)
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{
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case 'd':
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case 'i':
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case 'o':
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case 'u':
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case 'x':
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case 'X':
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case 'c':
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(void) va_arg (ap, int);
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break;
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case 'f':
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case 'e':
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case 'E':
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case 'g':
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case 'G':
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(void) va_arg (ap, double);
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/* Since an ieee double can have an exponent of 307, we'll
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make the buffer wide enough to cover the gross case. */
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total_width += 307;
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break;
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case 's':
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total_width += strlen (va_arg (ap, char *));
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break;
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case 'p':
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case 'n':
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(void) va_arg (ap, char *);
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break;
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}
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p++;
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}
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}
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#ifdef va_copy
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va_end (ap);
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#endif
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return total_width;
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}
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