| 1 | /* Estimate the length of the string generated by a vprintf-like |
| 2 | function. Used by vasprintf and xvasprintf. |
| 3 | Copyright (C) 1994, 2003, 2011, 2013, 2014 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the libiberty library. |
| 6 | Libiberty is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Library General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2 of the License, or (at your option) any later version. |
| 10 | |
| 11 | Libiberty is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Library General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Library General Public |
| 17 | License along with libiberty; see the file COPYING.LIB. If not, write |
| 18 | to the Free Software Foundation, Inc., 51 Franklin Street - Fifth |
| 19 | Floor, Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | #include "config.h" |
| 23 | #endif |
| 24 | #include <ansidecl.h> |
| 25 | #include <stdarg.h> |
| 26 | #if !defined (va_copy) && defined (__va_copy) |
| 27 | # define va_copy(d,s) __va_copy((d),(s)) |
| 28 | #endif |
| 29 | #include <stdio.h> |
| 30 | #ifdef HAVE_STRING_H |
| 31 | #include <string.h> |
| 32 | #endif |
| 33 | #ifdef HAVE_STDLIB_H |
| 34 | #include <stdlib.h> |
| 35 | #else |
| 36 | extern unsigned long strtoul (); |
| 37 | #endif |
| 38 | #include "libiberty.h" |
| 39 | |
| 40 | int |
| 41 | libiberty_vprintf_buffer_size (const char *format, va_list args) |
| 42 | { |
| 43 | const char *p = format; |
| 44 | /* Add one to make sure that it is never zero, which might cause malloc |
| 45 | to return NULL. */ |
| 46 | int total_width = strlen (format) + 1; |
| 47 | va_list ap; |
| 48 | |
| 49 | #ifdef va_copy |
| 50 | va_copy (ap, args); |
| 51 | #else |
| 52 | memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list)); |
| 53 | #endif |
| 54 | |
| 55 | while (*p != '\0') |
| 56 | { |
| 57 | if (*p++ == '%') |
| 58 | { |
| 59 | while (strchr ("-+ #0", *p)) |
| 60 | ++p; |
| 61 | if (*p == '*') |
| 62 | { |
| 63 | ++p; |
| 64 | total_width += abs (va_arg (ap, int)); |
| 65 | } |
| 66 | else |
| 67 | total_width += strtoul (p, (char **) &p, 10); |
| 68 | if (*p == '.') |
| 69 | { |
| 70 | ++p; |
| 71 | if (*p == '*') |
| 72 | { |
| 73 | ++p; |
| 74 | total_width += abs (va_arg (ap, int)); |
| 75 | } |
| 76 | else |
| 77 | total_width += strtoul (p, (char **) &p, 10); |
| 78 | } |
| 79 | while (strchr ("hlL", *p)) |
| 80 | ++p; |
| 81 | /* Should be big enough for any format specifier except %s and floats. */ |
| 82 | total_width += 30; |
| 83 | switch (*p) |
| 84 | { |
| 85 | case 'd': |
| 86 | case 'i': |
| 87 | case 'o': |
| 88 | case 'u': |
| 89 | case 'x': |
| 90 | case 'X': |
| 91 | case 'c': |
| 92 | (void) va_arg (ap, int); |
| 93 | break; |
| 94 | case 'f': |
| 95 | case 'e': |
| 96 | case 'E': |
| 97 | case 'g': |
| 98 | case 'G': |
| 99 | (void) va_arg (ap, double); |
| 100 | /* Since an ieee double can have an exponent of 307, we'll |
| 101 | make the buffer wide enough to cover the gross case. */ |
| 102 | total_width += 307; |
| 103 | break; |
| 104 | case 's': |
| 105 | total_width += strlen (va_arg (ap, char *)); |
| 106 | break; |
| 107 | case 'p': |
| 108 | case 'n': |
| 109 | (void) va_arg (ap, char *); |
| 110 | break; |
| 111 | } |
| 112 | p++; |
| 113 | } |
| 114 | } |
| 115 | #ifdef va_copy |
| 116 | va_end (ap); |
| 117 | #endif |
| 118 | return total_width; |
| 119 | } |