| /* Estimate the length of the string generated by a vprintf-like |
| function. Used by vasprintf and xvasprintf. |
| Copyright (C) 1994-2019 Free Software Foundation, Inc. |
| |
| This file is part of the libiberty library. |
| Libiberty is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| Libiberty 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 GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with libiberty; see the file COPYING.LIB. If not, write |
| to the Free Software Foundation, Inc., 51 Franklin Street - Fifth |
| Floor, Boston, MA 02110-1301, USA. */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #include <ansidecl.h> |
| #include <stdarg.h> |
| #if !defined (va_copy) && defined (__va_copy) |
| # define va_copy(d,s) __va_copy((d),(s)) |
| #endif |
| #include <stdio.h> |
| #ifdef HAVE_STRING_H |
| #include <string.h> |
| #endif |
| #ifdef HAVE_STDLIB_H |
| #include <stdlib.h> |
| #else |
| extern unsigned long strtoul (); |
| #endif |
| #include "libiberty.h" |
| |
| int |
| libiberty_vprintf_buffer_size (const char *format, va_list args) |
| { |
| const char *p = format; |
| /* Add one to make sure that it is never zero, which might cause malloc |
| to return NULL. */ |
| int total_width = strlen (format) + 1; |
| va_list ap; |
| |
| #ifdef va_copy |
| va_copy (ap, args); |
| #else |
| memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list)); |
| #endif |
| |
| while (*p != '\0') |
| { |
| if (*p++ == '%') |
| { |
| while (strchr ("-+ #0", *p)) |
| ++p; |
| if (*p == '*') |
| { |
| ++p; |
| total_width += abs (va_arg (ap, int)); |
| } |
| else |
| total_width += strtoul (p, (char **) &p, 10); |
| if (*p == '.') |
| { |
| ++p; |
| if (*p == '*') |
| { |
| ++p; |
| total_width += abs (va_arg (ap, int)); |
| } |
| else |
| total_width += strtoul (p, (char **) &p, 10); |
| } |
| while (strchr ("hlL", *p)) |
| ++p; |
| /* Should be big enough for any format specifier except %s and floats. */ |
| total_width += 30; |
| switch (*p) |
| { |
| case 'd': |
| case 'i': |
| case 'o': |
| case 'u': |
| case 'x': |
| case 'X': |
| case 'c': |
| (void) va_arg (ap, int); |
| break; |
| case 'f': |
| case 'e': |
| case 'E': |
| case 'g': |
| case 'G': |
| (void) va_arg (ap, double); |
| /* Since an ieee double can have an exponent of 307, we'll |
| make the buffer wide enough to cover the gross case. */ |
| total_width += 307; |
| break; |
| case 's': |
| total_width += strlen (va_arg (ap, char *)); |
| break; |
| case 'p': |
| case 'n': |
| (void) va_arg (ap, char *); |
| break; |
| } |
| p++; |
| } |
| } |
| #ifdef va_copy |
| va_end (ap); |
| #endif |
| return total_width; |
| } |