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annotate lib/snprintf.c @ 5290:a32d2a4a925f

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Fixes, mostly from Simon Josefsson.
author Bruno Haible <bruno@clisp.org>
date Fri, 01 Oct 2004 10:26:52 +0000
parents 553713ba9dac
children 2b9cda789a2d
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1 /* Formatted output to strings.
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2 Copyright (C) 2004 Free Software Foundation, Inc.
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3 Written by Simon Josefsson.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License along
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16 with this program; if not, write to the Free Software Foundation,
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17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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18
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19 #ifdef HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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22
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23 /* Specification. */
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24 #include "snprintf.h"
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25
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26 /* Get va_list, va_start, va_end. */
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27 #include <stdarg.h>
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28 /* Get free. */
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29 #include <stdlib.h>
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30 /* Get memcpy, size_t. */
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31 #include <string.h>
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32
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33 /* Get vasnprintf. */
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34 #include "vasnprintf.h"
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35
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36 /* Get MIN. */
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37 #include "minmax.h"
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38
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39 /* Print formatted output to string STR. Similar to sprintf, but
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40 additional length SIZE limit how much is written into STR. Returns
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41 string length of formatted string (which may be larger than SIZE).
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42 STR may be NULL, in which case nothing will be written. On error,
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43 return a negative value. */
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44 int
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45 snprintf (char *str, size_t size, const char *format, ...)
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46 {
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47 char *output;
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48 size_t len;
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49 va_list args;
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50
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51 va_start (args, format);
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52 output = vasnprintf (NULL, &len, format, args);
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53 va_end (args);
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54
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55 if (!output)
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56 return -1;
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57
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58 if (str)
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59 {
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60 memcpy (str, output, MIN (len + 1, size));
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61 str[size - 1] = '\0';
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62 }
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63
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64 free (output);
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65
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66 return len;
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67 }