diff options
Diffstat (limited to 'gl/snprintf.c')
-rw-r--r-- | gl/snprintf.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/gl/snprintf.c b/gl/snprintf.c new file mode 100644 index 00000000..db1ca9af --- /dev/null +++ b/gl/snprintf.c | |||
@@ -0,0 +1,76 @@ | |||
1 | /* Formatted output to strings. | ||
2 | Copyright (C) 2004, 2006 Free Software Foundation, Inc. | ||
3 | Written by Simon Josefsson and Paul Eggert. | ||
4 | |||
5 | This program is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as published by | ||
7 | the Free Software Foundation; either version 2, or (at your option) | ||
8 | any later version. | ||
9 | |||
10 | This program is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | GNU General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License along | ||
16 | with this program; if not, write to the Free Software Foundation, | ||
17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | ||
18 | |||
19 | #include <config.h> | ||
20 | |||
21 | #include "snprintf.h" | ||
22 | |||
23 | #include <errno.h> | ||
24 | #include <limits.h> | ||
25 | #include <stdarg.h> | ||
26 | #include <stdlib.h> | ||
27 | #include <string.h> | ||
28 | |||
29 | #include "vasnprintf.h" | ||
30 | |||
31 | /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */ | ||
32 | #ifndef EOVERFLOW | ||
33 | # define EOVERFLOW E2BIG | ||
34 | #endif | ||
35 | |||
36 | /* Print formatted output to string STR. Similar to sprintf, but | ||
37 | additional length SIZE limit how much is written into STR. Returns | ||
38 | string length of formatted string (which may be larger than SIZE). | ||
39 | STR may be NULL, in which case nothing will be written. On error, | ||
40 | return a negative value. */ | ||
41 | int | ||
42 | snprintf (char *str, size_t size, const char *format, ...) | ||
43 | { | ||
44 | char *output; | ||
45 | size_t len; | ||
46 | size_t lenbuf = size; | ||
47 | va_list args; | ||
48 | |||
49 | va_start (args, format); | ||
50 | output = vasnprintf (str, &lenbuf, format, args); | ||
51 | len = lenbuf; | ||
52 | va_end (args); | ||
53 | |||
54 | if (!output) | ||
55 | return -1; | ||
56 | |||
57 | if (output != str) | ||
58 | { | ||
59 | if (size) | ||
60 | { | ||
61 | size_t pruned_len = (len < size ? len : size - 1); | ||
62 | memcpy (str, output, pruned_len); | ||
63 | str[pruned_len] = '\0'; | ||
64 | } | ||
65 | |||
66 | free (output); | ||
67 | } | ||
68 | |||
69 | if (INT_MAX < len) | ||
70 | { | ||
71 | errno = EOVERFLOW; | ||
72 | return -1; | ||
73 | } | ||
74 | |||
75 | return len; | ||
76 | } | ||