| 1 | /* Like vsprintf but provides a pointer to malloc'd storage, which must |
| 2 | be freed by the caller. |
| 3 | Copyright (C) 1994, 2003 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 |
| 18 | not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | #include "config.h" |
| 23 | #endif |
| 24 | #include <ansidecl.h> |
| 25 | #ifdef ANSI_PROTOTYPES |
| 26 | #include <stdarg.h> |
| 27 | #else |
| 28 | #include <varargs.h> |
| 29 | #endif |
| 30 | #include <stdio.h> |
| 31 | #ifdef HAVE_STRING_H |
| 32 | #include <string.h> |
| 33 | #endif |
| 34 | #ifdef HAVE_STDLIB_H |
| 35 | #include <stdlib.h> |
| 36 | #else |
| 37 | extern unsigned long strtoul (); |
| 38 | extern PTR malloc (); |
| 39 | #endif |
| 40 | #include "libiberty.h" |
| 41 | |
| 42 | #ifdef TEST |
| 43 | int global_total_width; |
| 44 | #endif |
| 45 | |
| 46 | /* |
| 47 | |
| 48 | @deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args}) |
| 49 | |
| 50 | Like @code{vsprintf}, but instead of passing a pointer to a buffer, |
| 51 | you pass a pointer to a pointer. This function will compute the size |
| 52 | of the buffer needed, allocate memory with @code{malloc}, and store a |
| 53 | pointer to the allocated memory in @code{*@var{resptr}}. The value |
| 54 | returned is the same as @code{vsprintf} would return. If memory could |
| 55 | not be allocated, minus one is returned and @code{NULL} is stored in |
| 56 | @code{*@var{resptr}}. |
| 57 | |
| 58 | @end deftypefn |
| 59 | |
| 60 | */ |
| 61 | |
| 62 | static int int_vasprintf PARAMS ((char **, const char *, va_list)); |
| 63 | |
| 64 | static int |
| 65 | int_vasprintf (result, format, args) |
| 66 | char **result; |
| 67 | const char *format; |
| 68 | va_list args; |
| 69 | { |
| 70 | const char *p = format; |
| 71 | /* Add one to make sure that it is never zero, which might cause malloc |
| 72 | to return NULL. */ |
| 73 | int total_width = strlen (format) + 1; |
| 74 | va_list ap; |
| 75 | |
| 76 | #ifdef va_copy |
| 77 | va_copy (ap, args); |
| 78 | #else |
| 79 | memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list)); |
| 80 | #endif |
| 81 | |
| 82 | while (*p != '\0') |
| 83 | { |
| 84 | if (*p++ == '%') |
| 85 | { |
| 86 | while (strchr ("-+ #0", *p)) |
| 87 | ++p; |
| 88 | if (*p == '*') |
| 89 | { |
| 90 | ++p; |
| 91 | total_width += abs (va_arg (ap, int)); |
| 92 | } |
| 93 | else |
| 94 | total_width += strtoul (p, (char **) &p, 10); |
| 95 | if (*p == '.') |
| 96 | { |
| 97 | ++p; |
| 98 | if (*p == '*') |
| 99 | { |
| 100 | ++p; |
| 101 | total_width += abs (va_arg (ap, int)); |
| 102 | } |
| 103 | else |
| 104 | total_width += strtoul (p, (char **) &p, 10); |
| 105 | } |
| 106 | while (strchr ("hlL", *p)) |
| 107 | ++p; |
| 108 | /* Should be big enough for any format specifier except %s and floats. */ |
| 109 | total_width += 30; |
| 110 | switch (*p) |
| 111 | { |
| 112 | case 'd': |
| 113 | case 'i': |
| 114 | case 'o': |
| 115 | case 'u': |
| 116 | case 'x': |
| 117 | case 'X': |
| 118 | case 'c': |
| 119 | (void) va_arg (ap, int); |
| 120 | break; |
| 121 | case 'f': |
| 122 | case 'e': |
| 123 | case 'E': |
| 124 | case 'g': |
| 125 | case 'G': |
| 126 | (void) va_arg (ap, double); |
| 127 | /* Since an ieee double can have an exponent of 307, we'll |
| 128 | make the buffer wide enough to cover the gross case. */ |
| 129 | total_width += 307; |
| 130 | break; |
| 131 | case 's': |
| 132 | total_width += strlen (va_arg (ap, char *)); |
| 133 | break; |
| 134 | case 'p': |
| 135 | case 'n': |
| 136 | (void) va_arg (ap, char *); |
| 137 | break; |
| 138 | } |
| 139 | p++; |
| 140 | } |
| 141 | } |
| 142 | #ifdef va_copy |
| 143 | va_end (ap); |
| 144 | #endif |
| 145 | #ifdef TEST |
| 146 | global_total_width = total_width; |
| 147 | #endif |
| 148 | *result = (char *) malloc (total_width); |
| 149 | if (*result != NULL) |
| 150 | return vsprintf (*result, format, args); |
| 151 | else |
| 152 | return -1; |
| 153 | } |
| 154 | |
| 155 | int |
| 156 | vasprintf (result, format, args) |
| 157 | char **result; |
| 158 | const char *format; |
| 159 | #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__) |
| 160 | _BSD_VA_LIST_ args; |
| 161 | #else |
| 162 | va_list args; |
| 163 | #endif |
| 164 | { |
| 165 | return int_vasprintf (result, format, args); |
| 166 | } |
| 167 | |
| 168 | #ifdef TEST |
| 169 | static void ATTRIBUTE_PRINTF_1 |
| 170 | checkit VPARAMS ((const char *format, ...)) |
| 171 | { |
| 172 | char *result; |
| 173 | VA_OPEN (args, format); |
| 174 | VA_FIXEDARG (args, const char *, format); |
| 175 | vasprintf (&result, format, args); |
| 176 | VA_CLOSE (args); |
| 177 | |
| 178 | if (strlen (result) < (size_t) global_total_width) |
| 179 | printf ("PASS: "); |
| 180 | else |
| 181 | printf ("FAIL: "); |
| 182 | printf ("%d %s\n", global_total_width, result); |
| 183 | |
| 184 | free (result); |
| 185 | } |
| 186 | |
| 187 | extern int main PARAMS ((void)); |
| 188 | |
| 189 | int |
| 190 | main () |
| 191 | { |
| 192 | checkit ("%d", 0x12345678); |
| 193 | checkit ("%200d", 5); |
| 194 | checkit ("%.300d", 6); |
| 195 | checkit ("%100.150d", 7); |
| 196 | checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\ |
| 197 | 777777777777777777333333333333366666666666622222222222777777777777733333"); |
| 198 | checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx"); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | #endif /* TEST */ |