comparison: honeyd/vasprintf.c
honeyd/vasprintf.c
- changeset 601
- 969c819f102b
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| -1:000000000000 | 0:912727414976 |
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| 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 #include <stdarg.h> | |
| 22 #include <stdio.h> | |
| 23 #include <stdlib.h> | |
| 24 #include <string.h> | |
| 25 #include "vasprintf.h" | |
| 26 | |
| 27 /* | |
| 28 | |
| 29 @deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args}) | |
| 30 | |
| 31 Like @code{vsprintf}, but instead of passing a pointer to a buffer, | |
| 32 you pass a pointer to a pointer. This function will compute the size | |
| 33 of the buffer needed, allocate memory with @code{malloc}, and store a | |
| 34 pointer to the allocated memory in @code{*@var{resptr}}. The value | |
| 35 returned is the same as @code{vsprintf} would return. If memory could | |
| 36 not be allocated, minus one is returned and @code{NULL} is stored in | |
| 37 @code{*@var{resptr}}. | |
| 38 | |
| 39 @end deftypefn | |
| 40 | |
| 41 */ | |
| 42 | |
| 43 static int int_vasprintf(char **, const char *, va_list); | |
| 44 | |
| 45 static int | |
| 46 int_vasprintf (result, format, args) | |
| 47 char **result; | |
| 48 const char *format; | |
| 49 va_list args; | |
| 50 { | |
| 51 const char *p = format; | |
| 52 /* Add one to make sure that it is never zero, which might cause malloc | |
| 53 to return NULL. */ | |
| 54 int total_width = strlen (format) + 1; | |
| 55 va_list ap; | |
| 56 | |
| 57 memcpy ((void *) &ap, (const void *) &args, sizeof (va_list)); | |
| 58 | |
| 59 while (*p != '\0') | |
| 60 { | |
| 61 if (*p++ == '%') | |
| 62 { | |
| 63 while (strchr ("-+ #0", *p)) | |
| 64 ++p; | |
| 65 if (*p == '*') | |
| 66 { | |
| 67 ++p; | |
| 68 total_width += abs (va_arg (ap, int)); | |
| 69 } | |
| 70 else | |
| 71 total_width += strtoul (p, (char **) &p, 10); | |
| 72 if (*p == '.') | |
| 73 { | |
| 74 ++p; | |
| 75 if (*p == '*') | |
| 76 { | |
| 77 ++p; | |
| 78 total_width += abs (va_arg (ap, int)); | |
| 79 } | |
| 80 else | |
| 81 total_width += strtoul (p, (char **) &p, 10); | |
| 82 } | |
| 83 while (strchr ("hlL", *p)) | |
| 84 ++p; | |
| 85 /* Should be big enough for any format specifier except %s and floats. */ | |
| 86 total_width += 30; | |
| 87 switch (*p) | |
| 88 { | |
| 89 case 'd': | |
| 90 case 'i': | |
| 91 case 'o': | |
| 92 case 'u': | |
| 93 case 'x': | |
| 94 case 'X': | |
| 95 case 'c': | |
| 96 (void) va_arg (ap, int); | |
| 97 break; | |
| 98 case 'f': | |
| 99 case 'e': | |
| 100 case 'E': | |
| 101 case 'g': | |
| 102 case 'G': | |
| 103 (void) va_arg (ap, double); | |
| 104 /* Since an ieee double can have an exponent of 307, we'll | |
| 105 make the buffer wide enough to cover the gross case. */ | |
| 106 total_width += 307; | |
| 107 break; | |
| 108 case 's': | |
| 109 total_width += strlen (va_arg (ap, char *)); | |
| 110 break; | |
| 111 case 'p': | |
| 112 case 'n': | |
| 113 (void) va_arg (ap, char *); | |
| 114 break; | |
| 115 } | |
| 116 p++; | |
| 117 } | |
| 118 } | |
| 119 *result = (char *) malloc (total_width); | |
| 120 if (*result != NULL) | |
| 121 return vsprintf (*result, format, args); | |
| 122 else | |
| 123 return -1; | |
| 124 } | |
| 125 | |
| 126 int | |
| 127 vasprintf (result, format, args) | |
| 128 char **result; | |
| 129 const char *format; | |
| 130 va_list args; | |
| 131 { | |
| 132 return int_vasprintf (result, format, args); | |
| 133 } |
