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5191 | serge | 1 | /* Like vsprintf but provides a pointer to malloc'd storage, which must |
2 | be freed by the caller. |
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3 | Copyright (C) 1994, 2003, 2011 Free Software Foundation, Inc. |
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4 | |||
5 | This file is part of the libiberty library. |
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6 | Libiberty is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |||
11 | Libiberty 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 GNU |
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14 | Library General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU Library General Public |
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17 | License along with libiberty; see the file COPYING.LIB. If |
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18 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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19 | Boston, MA 02110-1301, USA. */ |
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20 | |||
21 | #ifdef HAVE_CONFIG_H |
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22 | #include "config.h" |
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23 | #endif |
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24 | #include |
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25 | #include |
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26 | #if !defined (va_copy) && defined (__va_copy) |
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27 | # define va_copy(d,s) __va_copy((d),(s)) |
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28 | #endif |
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29 | #include |
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30 | #ifdef HAVE_STRING_H |
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31 | #include |
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32 | #endif |
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33 | #ifdef HAVE_STDLIB_H |
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34 | #include |
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35 | #else |
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36 | extern unsigned long strtoul (); |
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37 | extern PTR malloc (); |
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38 | #endif |
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39 | #include "libiberty.h" |
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40 | |||
41 | #ifdef TEST |
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42 | int global_total_width; |
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43 | #endif |
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44 | |||
45 | /* |
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46 | |||
47 | @deftypefn Extension int vasprintf (char **@var{resptr}, @ |
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48 | const char *@var{format}, va_list @var{args}) |
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49 | |||
50 | Like @code{vsprintf}, but instead of passing a pointer to a buffer, |
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51 | you pass a pointer to a pointer. This function will compute the size |
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52 | of the buffer needed, allocate memory with @code{malloc}, and store a |
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53 | pointer to the allocated memory in @code{*@var{resptr}}. The value |
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54 | returned is the same as @code{vsprintf} would return. If memory could |
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55 | not be allocated, minus one is returned and @code{NULL} is stored in |
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56 | @code{*@var{resptr}}. |
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57 | |||
58 | @end deftypefn |
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59 | |||
60 | */ |
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61 | |||
62 | static int int_vasprintf (char **, const char *, va_list); |
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63 | |||
64 | static int |
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65 | int_vasprintf (char **result, const char *format, va_list args) |
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66 | { |
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67 | const char *p = format; |
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68 | /* Add one to make sure that it is never zero, which might cause malloc |
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69 | to return NULL. */ |
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70 | int total_width = strlen (format) + 1; |
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71 | va_list ap; |
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72 | |||
73 | #ifdef va_copy |
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74 | va_copy (ap, args); |
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75 | #else |
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76 | memcpy ((PTR) &ap, (PTR) &args, sizeof (va_list)); |
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77 | #endif |
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78 | |||
79 | while (*p != '\0') |
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80 | { |
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81 | if (*p++ == '%') |
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82 | { |
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83 | while (strchr ("-+ #0", *p)) |
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84 | ++p; |
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85 | if (*p == '*') |
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86 | { |
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87 | ++p; |
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88 | total_width += abs (va_arg (ap, int)); |
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89 | } |
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90 | else |
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91 | total_width += strtoul (p, (char **) &p, 10); |
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92 | if (*p == '.') |
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93 | { |
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94 | ++p; |
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95 | if (*p == '*') |
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96 | { |
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97 | ++p; |
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98 | total_width += abs (va_arg (ap, int)); |
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99 | } |
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100 | else |
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101 | total_width += strtoul (p, (char **) &p, 10); |
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102 | } |
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103 | while (strchr ("hlL", *p)) |
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104 | ++p; |
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105 | /* Should be big enough for any format specifier except %s and floats. */ |
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106 | total_width += 30; |
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107 | switch (*p) |
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108 | { |
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109 | case 'd': |
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110 | case 'i': |
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111 | case 'o': |
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112 | case 'u': |
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113 | case 'x': |
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114 | case 'X': |
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115 | case 'c': |
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116 | (void) va_arg (ap, int); |
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117 | break; |
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118 | case 'f': |
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119 | case 'e': |
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120 | case 'E': |
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121 | case 'g': |
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122 | case 'G': |
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123 | (void) va_arg (ap, double); |
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124 | /* Since an ieee double can have an exponent of 307, we'll |
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125 | make the buffer wide enough to cover the gross case. */ |
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126 | total_width += 307; |
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127 | break; |
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128 | case 's': |
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129 | total_width += strlen (va_arg (ap, char *)); |
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130 | break; |
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131 | case 'p': |
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132 | case 'n': |
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133 | (void) va_arg (ap, char *); |
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134 | break; |
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135 | } |
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136 | p++; |
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137 | } |
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138 | } |
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139 | #ifdef va_copy |
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140 | va_end (ap); |
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141 | #endif |
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142 | #ifdef TEST |
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143 | global_total_width = total_width; |
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144 | #endif |
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145 | *result = (char *) malloc (total_width); |
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146 | if (*result != NULL) |
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147 | return vsprintf (*result, format, args); |
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148 | else |
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149 | return -1; |
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150 | } |
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151 | |||
152 | int |
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153 | vasprintf (char **result, const char *format, |
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154 | #if defined (_BSD_VA_LIST_) && defined (__FreeBSD__) |
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155 | _BSD_VA_LIST_ args) |
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156 | #else |
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157 | va_list args) |
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158 | #endif |
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159 | { |
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160 | return int_vasprintf (result, format, args); |
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161 | } |
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162 | |||
163 | #ifdef TEST |
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164 | static void ATTRIBUTE_PRINTF_1 |
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165 | checkit (const char *format, ...) |
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166 | { |
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167 | char *result; |
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168 | VA_OPEN (args, format); |
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169 | VA_FIXEDARG (args, const char *, format); |
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170 | vasprintf (&result, format, args); |
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171 | VA_CLOSE (args); |
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172 | |||
173 | if (strlen (result) < (size_t) global_total_width) |
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174 | printf ("PASS: "); |
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175 | else |
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176 | printf ("FAIL: "); |
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177 | printf ("%d %s\n", global_total_width, result); |
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178 | |||
179 | free (result); |
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180 | } |
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181 | |||
182 | extern int main (void); |
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183 | |||
184 | int |
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185 | main (void) |
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186 | { |
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187 | checkit ("%d", 0x12345678); |
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188 | checkit ("%200d", 5); |
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189 | checkit ("%.300d", 6); |
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190 | checkit ("%100.150d", 7); |
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191 | checkit ("%s", "jjjjjjjjjiiiiiiiiiiiiiiioooooooooooooooooppppppppppppaa\n\ |
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192 | 777777777777777777333333333333366666666666622222222222777777777777733333"); |
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193 | checkit ("%f%s%d%s", 1.0, "foo", 77, "asdjffffffffffffffiiiiiiiiiiixxxxx"); |
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194 | |||
195 | return 0; |
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196 | } |
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197 | #endif /* TEST */> |