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1 /* Implement the vsnprintf function.
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2 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
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3 Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
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4
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5 This file is part of the libiberty library. This library is free
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6 software; you can redistribute it and/or modify it under the
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7 terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 This library is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GNU CC; see the file COPYING. If not, write to
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18 the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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19
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20 As a special exception, if you link this library with files
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21 compiled with a GNU compiler to produce an executable, this does not cause
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22 the resulting executable to be covered by the GNU General Public License.
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23 This exception does not however invalidate any other reasons why
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24 the executable file might be covered by the GNU General Public License. */
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25
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26 /*
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27
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28 @deftypefn Supplemental int vsnprintf (char *@var{buf}, size_t @var{n}, const char *@var{format}, va_list @var{ap})
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29
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30 This function is similar to vsprintf, but it will print at most
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31 @var{n} characters. On error the return value is -1, otherwise it
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32 returns the number of characters that would have been printed had
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33 @var{n} been sufficiently large, regardless of the actual value of
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34 @var{n}. Note some pre-C99 system libraries do not implement this
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35 correctly so users cannot generally rely on the return value if the
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36 system version of this function is used.
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37
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38 @end deftypefn
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39
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40 */
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41
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42 #include "config.h"
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43 #include "ansidecl.h"
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44
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45 #include <stdarg.h>
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46 #ifdef HAVE_STRING_H
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47 #include <string.h>
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48 #endif
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49 #ifdef HAVE_STDLIB_H
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50 #include <stdlib.h>
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51 #endif
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52
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53 #include "libiberty.h"
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54
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55 /* This implementation relies on a working vasprintf. */
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56 int
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57 vsnprintf (char *s, size_t n, const char *format, va_list ap)
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58 {
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59 char *buf = 0;
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60 int result = vasprintf (&buf, format, ap);
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61
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62 if (!buf)
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63 return -1;
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64 if (result < 0)
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65 {
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66 free (buf);
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67 return -1;
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68 }
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69
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70 result = strlen (buf);
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71 if (n > 0)
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72 {
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73 if ((long) n > result)
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74 memcpy (s, buf, result+1);
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75 else
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76 {
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77 memcpy (s, buf, n-1);
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78 s[n - 1] = 0;
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79 }
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80 }
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81 free (buf);
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82 return result;
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83 }
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84
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85 #ifdef TEST
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86 /* Set the buffer to a known state. */
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87 #define CLEAR(BUF) do { memset ((BUF), 'X', sizeof (BUF)); (BUF)[14] = '\0'; } while (0)
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88 /* For assertions. */
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89 #define VERIFY(P) do { if (!(P)) abort(); } while (0)
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90
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91 static int ATTRIBUTE_PRINTF_3
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92 checkit (char *s, size_t n, const char *format, ...)
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93 {
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94 int result;
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95 VA_OPEN (ap, format);
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96 VA_FIXEDARG (ap, char *, s);
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97 VA_FIXEDARG (ap, size_t, n);
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98 VA_FIXEDARG (ap, const char *, format);
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99 result = vsnprintf (s, n, format, ap);
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100 VA_CLOSE (ap);
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101 return result;
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102 }
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103
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104 extern int main (void);
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105 int
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106 main (void)
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107 {
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108 char buf[128];
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109 int status;
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110
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111 CLEAR (buf);
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112 status = checkit (buf, 10, "%s:%d", "foobar", 9);
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113 VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);
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114
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115 CLEAR (buf);
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116 status = checkit (buf, 9, "%s:%d", "foobar", 9);
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117 VERIFY (status==8 && memcmp (buf, "foobar:9\0XXXXX\0", 15) == 0);
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118
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119 CLEAR (buf);
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120 status = checkit (buf, 8, "%s:%d", "foobar", 9);
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121 VERIFY (status==8 && memcmp (buf, "foobar:\0XXXXXX\0", 15) == 0);
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122
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123 CLEAR (buf);
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124 status = checkit (buf, 7, "%s:%d", "foobar", 9);
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125 VERIFY (status==8 && memcmp (buf, "foobar\0XXXXXXX\0", 15) == 0);
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126
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127 CLEAR (buf);
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128 status = checkit (buf, 6, "%s:%d", "foobar", 9);
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129 VERIFY (status==8 && memcmp (buf, "fooba\0XXXXXXXX\0", 15) == 0);
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130
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131 CLEAR (buf);
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132 status = checkit (buf, 2, "%s:%d", "foobar", 9);
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133 VERIFY (status==8 && memcmp (buf, "f\0XXXXXXXXXXXX\0", 15) == 0);
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134
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135 CLEAR (buf);
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136 status = checkit (buf, 1, "%s:%d", "foobar", 9);
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137 VERIFY (status==8 && memcmp (buf, "\0XXXXXXXXXXXXX\0", 15) == 0);
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138
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139 CLEAR (buf);
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140 status = checkit (buf, 0, "%s:%d", "foobar", 9);
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141 VERIFY (status==8 && memcmp (buf, "XXXXXXXXXXXXXX\0", 15) == 0);
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142
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143 return 0;
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144 }
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145 #endif /* TEST */
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