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01ca36af UB |
1 | /* Estimate the length of the string generated by a vprintf-like |
2 | function. Used by vasprintf and xvasprintf. | |
a945c346 | 3 | Copyright (C) 1994-2024 Free Software Foundation, Inc. |
01ca36af UB |
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 | |
50b009c5 | 52 | memcpy ((void *) &ap, (void *) &args, sizeof (va_list)); |
01ca36af UB |
53 | #endif |
54 | ||
55 | while (*p != '\0') | |
56 | { | |
57 | if (*p++ == '%') | |
58 | { | |
53bb7145 | 59 | int prec = 0; |
01ca36af UB |
60 | while (strchr ("-+ #0", *p)) |
61 | ++p; | |
62 | if (*p == '*') | |
63 | { | |
64 | ++p; | |
65 | total_width += abs (va_arg (ap, int)); | |
66 | } | |
67 | else | |
68 | total_width += strtoul (p, (char **) &p, 10); | |
69 | if (*p == '.') | |
70 | { | |
71 | ++p; | |
72 | if (*p == '*') | |
73 | { | |
74 | ++p; | |
75 | total_width += abs (va_arg (ap, int)); | |
76 | } | |
77 | else | |
78 | total_width += strtoul (p, (char **) &p, 10); | |
79 | } | |
53bb7145 JJ |
80 | do |
81 | { | |
82 | switch (*p) | |
83 | { | |
84 | case 'h': | |
85 | ++p; | |
86 | continue; | |
87 | case 'l': | |
88 | case 'L': | |
89 | ++prec; | |
90 | ++p; | |
91 | continue; | |
92 | case 'z': | |
93 | prec = 3; | |
94 | ++p; | |
95 | continue; | |
96 | case 't': | |
97 | prec = 4; | |
98 | ++p; | |
99 | continue; | |
100 | #ifdef _WIN32 | |
101 | case 'I': | |
102 | if (p[1] == '6' && p[2] == '4') | |
103 | { | |
104 | prec = 2; | |
105 | p += 3; | |
106 | continue; | |
107 | } | |
108 | break; | |
109 | #endif | |
110 | default: | |
111 | break; | |
112 | } | |
113 | break; | |
114 | } | |
115 | while (1); | |
116 | ||
01ca36af UB |
117 | /* Should be big enough for any format specifier except %s and floats. */ |
118 | total_width += 30; | |
119 | switch (*p) | |
120 | { | |
121 | case 'd': | |
122 | case 'i': | |
123 | case 'o': | |
124 | case 'u': | |
125 | case 'x': | |
126 | case 'X': | |
53bb7145 JJ |
127 | switch (prec) |
128 | { | |
129 | case 0: (void) va_arg (ap, int); break; | |
130 | case 1: (void) va_arg (ap, long int); break; | |
131 | case 2: (void) va_arg (ap, long long int); break; | |
132 | case 3: (void) va_arg (ap, size_t); break; | |
133 | case 4: (void) va_arg (ap, ptrdiff_t); break; | |
134 | } | |
135 | break; | |
01ca36af UB |
136 | case 'c': |
137 | (void) va_arg (ap, int); | |
138 | break; | |
139 | case 'f': | |
140 | case 'e': | |
141 | case 'E': | |
142 | case 'g': | |
143 | case 'G': | |
53bb7145 JJ |
144 | if (!prec) |
145 | { | |
146 | (void) va_arg (ap, double); | |
147 | /* Since an ieee double can have an exponent of 308, we'll | |
148 | make the buffer wide enough to cover the gross case. */ | |
149 | total_width += 308; | |
150 | } | |
151 | else | |
152 | { | |
153 | (void) va_arg (ap, long double); | |
154 | total_width += 4932; | |
155 | } | |
01ca36af UB |
156 | break; |
157 | case 's': | |
158 | total_width += strlen (va_arg (ap, char *)); | |
159 | break; | |
160 | case 'p': | |
161 | case 'n': | |
162 | (void) va_arg (ap, char *); | |
163 | break; | |
164 | } | |
165 | p++; | |
166 | } | |
167 | } | |
168 | #ifdef va_copy | |
169 | va_end (ap); | |
170 | #endif | |
171 | return total_width; | |
172 | } |