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