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1 /* Estimate the length of the string generated by a vprintf-like
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2 function. Used by vasprintf and xvasprintf.
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145
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3 Copyright (C) 1994-2020 Free Software Foundation, Inc.
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111
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4
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5 This file is part of the libiberty library.
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6 Libiberty is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU Library General Public
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8 License as published by the Free Software Foundation; either
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9 version 2 of the License, or (at your option) any later version.
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10
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11 Libiberty is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 Library General Public License for more details.
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15
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16 You should have received a copy of the GNU Library General Public
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17 License along with libiberty; see the file COPYING.LIB. If not, write
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18 to the Free Software Foundation, Inc., 51 Franklin Street - Fifth
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19 Floor, Boston, MA 02110-1301, USA. */
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20
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21 #ifdef HAVE_CONFIG_H
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22 #include "config.h"
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23 #endif
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24 #include <ansidecl.h>
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25 #include <stdarg.h>
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26 #if !defined (va_copy) && defined (__va_copy)
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27 # define va_copy(d,s) __va_copy((d),(s))
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28 #endif
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29 #include <stdio.h>
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30 #ifdef HAVE_STRING_H
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31 #include <string.h>
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32 #endif
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33 #ifdef HAVE_STDLIB_H
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34 #include <stdlib.h>
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35 #else
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36 extern unsigned long strtoul ();
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37 #endif
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38 #include "libiberty.h"
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39
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40 int
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41 libiberty_vprintf_buffer_size (const char *format, va_list args)
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42 {
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43 const char *p = format;
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44 /* Add one to make sure that it is never zero, which might cause malloc
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45 to return NULL. */
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46 int total_width = strlen (format) + 1;
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47 va_list ap;
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48
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49 #ifdef va_copy
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50 va_copy (ap, args);
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51 #else
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52 memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list));
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53 #endif
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54
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55 while (*p != '\0')
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56 {
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57 if (*p++ == '%')
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58 {
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59 while (strchr ("-+ #0", *p))
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60 ++p;
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61 if (*p == '*')
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62 {
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63 ++p;
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64 total_width += abs (va_arg (ap, int));
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65 }
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66 else
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67 total_width += strtoul (p, (char **) &p, 10);
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68 if (*p == '.')
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69 {
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70 ++p;
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71 if (*p == '*')
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72 {
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73 ++p;
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74 total_width += abs (va_arg (ap, int));
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75 }
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76 else
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77 total_width += strtoul (p, (char **) &p, 10);
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78 }
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79 while (strchr ("hlL", *p))
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80 ++p;
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81 /* Should be big enough for any format specifier except %s and floats. */
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82 total_width += 30;
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83 switch (*p)
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84 {
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85 case 'd':
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86 case 'i':
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87 case 'o':
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88 case 'u':
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89 case 'x':
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90 case 'X':
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91 case 'c':
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92 (void) va_arg (ap, int);
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93 break;
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94 case 'f':
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95 case 'e':
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96 case 'E':
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97 case 'g':
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98 case 'G':
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99 (void) va_arg (ap, double);
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100 /* Since an ieee double can have an exponent of 307, we'll
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101 make the buffer wide enough to cover the gross case. */
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102 total_width += 307;
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103 break;
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104 case 's':
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105 total_width += strlen (va_arg (ap, char *));
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106 break;
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107 case 'p':
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108 case 'n':
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109 (void) va_arg (ap, char *);
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110 break;
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111 }
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112 p++;
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113 }
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114 }
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115 #ifdef va_copy
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116 va_end (ap);
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117 #endif
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118 return total_width;
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119 }
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