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111
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1 /****************************************************************************
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2 * *
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3 * GNAT RUN-TIME COMPONENTS *
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4 * *
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5 * C S T R E A M S *
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6 * *
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7 * Auxiliary C functions for Interfaces.C.Streams *
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8 * *
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9 * Copyright (C) 1992-2017, Free Software Foundation, Inc. *
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10 * *
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11 * GNAT is free software; you can redistribute it and/or modify it under *
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12 * terms of the GNU General Public License as published by the Free Soft- *
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13 * ware Foundation; either version 3, or (at your option) any later ver- *
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14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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16 * or FITNESS FOR A PARTICULAR PURPOSE. *
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17 * *
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18 * As a special exception under Section 7 of GPL version 3, you are granted *
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19 * additional permissions described in the GCC Runtime Library Exception, *
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20 * version 3.1, as published by the Free Software Foundation. *
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21 * *
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22 * You should have received a copy of the GNU General Public License and *
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23 * a copy of the GCC Runtime Library Exception along with this program; *
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24 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
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25 * <http://www.gnu.org/licenses/>. *
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26 * *
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27 * GNAT was originally developed by the GNAT team at New York University. *
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28 * Extensive contributions were provided by Ada Core Technologies Inc. *
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29 * *
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30 ****************************************************************************/
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31
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32 /* Routines required for implementing routines in Interfaces.C.Streams. */
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33
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34 #ifndef _LARGEFILE_SOURCE
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35 #define _LARGEFILE_SOURCE
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36 #endif
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37 #define _FILE_OFFSET_BITS 64
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38 /* the define above will make off_t a 64bit type on GNU/Linux */
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39
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40 #include <stdio.h>
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41 #include <sys/types.h>
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42 #include <sys/stat.h>
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43 #include <unistd.h>
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44
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45 #ifdef _AIX
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46 /* needed to avoid conflicting declarations */
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47 #include <unistd.h>
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48 #include <sys/mman.h>
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49 #endif
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50
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51 #ifdef __vxworks
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52 #include "vxWorks.h"
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53 #endif
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54
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55 #ifdef IN_RTS
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56 #include "tconfig.h"
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57 #include "tsystem.h"
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58 #include <sys/stat.h>
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59 #else
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60 #include "config.h"
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61 #include "system.h"
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62 #endif
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63
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64 #include "adaint.h"
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65
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66 #ifdef __cplusplus
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67 extern "C" {
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68 #endif
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69
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70 #ifdef __linux__
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71 /* Don't use macros on GNU/Linux since they cause incompatible changes between
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72 glibc 2.0 and 2.1 */
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73
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74 #ifdef stderr
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75 # undef stderr
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76 #endif
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77 #ifdef stdin
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78 # undef stdin
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79 #endif
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80 #ifdef stdout
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81 # undef stdout
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82 #endif
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83
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84 #endif
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85
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86 /* Don't use macros versions of this functions on VxWorks since they cause
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87 imcompatible changes in some VxWorks versions */
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88 #ifdef __vxworks
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89 #undef getchar
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90 #undef putchar
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91 #undef feof
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92 #undef ferror
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93 #undef fileno
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94 #endif
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95
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96 /* The _IONBF value in MINGW32 stdio.h is wrong. */
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97 #if defined (WINNT) || defined (_WINNT)
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98 #if OLD_MINGW
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99 #undef _IONBF
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100 #define _IONBF 0004
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101 #endif
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102 #endif
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103
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104 int
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105 __gnat_feof (FILE *stream)
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106 {
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107 return (feof (stream));
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108 }
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109
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110 int
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111 __gnat_ferror (FILE *stream)
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112 {
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113 return (ferror (stream));
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114 }
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115
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116 int
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117 __gnat_fileno (FILE *stream)
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118 {
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119 return (fileno (stream));
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120 }
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121
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122 /* on some systems, the constants for seek are not defined, if so, then
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123 provide the conventional definitions */
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124
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125 #ifndef SEEK_SET
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126 #define SEEK_SET 0 /* Set file pointer to offset */
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127 #define SEEK_CUR 1 /* Set file pointer to its current value plus offset */
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128 #define SEEK_END 2 /* Set file pointer to the size of the file plus offset */
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129 #endif
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130
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131 /* if L_tmpnam is not set, use a large number that should be safe */
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132 #ifndef L_tmpnam
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133 #define L_tmpnam 256
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134 #endif
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135
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136 int __gnat_constant_eof = EOF;
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137 int __gnat_constant_iofbf = _IOFBF;
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138 int __gnat_constant_iolbf = _IOLBF;
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139 int __gnat_constant_ionbf = _IONBF;
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140 int __gnat_constant_l_tmpnam = L_tmpnam;
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141 int __gnat_constant_seek_cur = SEEK_CUR;
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142 int __gnat_constant_seek_end = SEEK_END;
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143 int __gnat_constant_seek_set = SEEK_SET;
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144
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145 FILE *
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146 __gnat_constant_stderr (void)
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147 {
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148 return stderr;
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149 }
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150
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151 FILE *
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152 __gnat_constant_stdin (void)
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153 {
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154 return stdin;
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155 }
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156
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157 FILE *
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158 __gnat_constant_stdout (void)
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159 {
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160 return stdout;
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161 }
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162
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163 char *
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164 __gnat_full_name (char *nam, char *buffer)
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165 {
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166 #ifdef RTSS
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167 /* RTSS applications have no current-directory notion, so RTSS file I/O
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168 requests must use fully qualified path names, such as:
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169 c:\temp\MyFile.txt (for a file system object)
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170 \\.\MyDevice0 (for a device object)
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171 */
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172 if (nam[1] == ':' || nam[0] == '\\')
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173 strcpy (buffer, nam);
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174 else
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175 buffer[0] = '\0';
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176
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177 #elif defined (__MINGW32__)
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178 /* If this is a device file return it as is;
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179 under Windows NT a device file ends with ":". */
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180 if (nam[strlen (nam) - 1] == ':')
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181 strcpy (buffer, nam);
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182 else
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183 {
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184 char *p;
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185
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186 _fullpath (buffer, nam, __gnat_max_path_len);
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187
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188 for (p = buffer; *p; p++)
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189 if (*p == '/')
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190 *p = '\\';
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191 }
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192
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193 #elif defined (__FreeBSD__) || defined (__DragonFly__) || defined (__OpenBSD__)
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194
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195 /* Use realpath function which resolves links and references to . and ..
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196 on those Unix systems that support it. Note that GNU/Linux provides it but
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197 cannot handle more than 5 symbolic links in a full name, so we use the
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198 getcwd approach instead. */
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199 realpath (nam, buffer);
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200
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201 #elif defined (__vxworks)
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202
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203 /* On VxWorks systems, an absolute path can be represented (depending on
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204 the host platform) as either /dir/file, or device:/dir/file, or
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205 device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
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206 to verify it. */
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207
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208 int length;
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209
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210 if (__gnat_is_absolute_path (nam, strlen (nam)))
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211 strcpy (buffer, nam);
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212
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213 else
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214 {
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215 length = __gnat_max_path_len;
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216 __gnat_get_current_dir (buffer, &length);
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217 strncat (buffer, nam, __gnat_max_path_len - length - 1);
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218 }
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219
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220 #else
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221 if (nam[0] != '/')
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222 {
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223 char *p = getcwd (buffer, __gnat_max_path_len);
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224
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225 if (p == 0)
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226 {
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227 buffer[0] = '\0';
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228 return 0;
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229 }
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230
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231
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232 /* If the name returned is an absolute path, it is safe to append '/'
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233 to the path and concatenate the name of the file. */
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234 if (buffer[0] == '/')
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235 strcat (buffer, "/");
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236
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237 strcat (buffer, nam);
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238 }
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239 else
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240 strcpy (buffer, nam);
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241 #endif
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242
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243 return buffer;
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244 }
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245
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246 #ifdef _WIN32
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247 /* On Windows we want to use the fseek/fteel supporting large files. This
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248 issue is due to the fact that a long on Win64 is still a 32 bits value */
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249 __int64
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250 __gnat_ftell64 (FILE *stream)
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251 {
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252 return _ftelli64 (stream);
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253 }
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254
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255 int
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256 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
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257 {
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258 return _fseeki64 (stream, offset, origin);
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259 }
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260
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261 #elif defined (__linux__) || defined (__sun__) || defined (__FreeBSD__) \
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262 || defined (__APPLE__)
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263 /* section for platforms having ftello/fseeko */
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264
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265 __int64
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266 __gnat_ftell64 (FILE *stream)
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267 {
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268 return (__int64)ftello (stream);
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269 }
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270
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271 int
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272 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
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273 {
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274 /* make sure that the offset is not bigger than the OS off_t, if so return
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275 with error as this mean that we are trying to handle files larger than
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276 2Gb on a patform not supporting it. */
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277 if ((off_t)offset == offset)
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278 return fseeko (stream, (off_t) offset, origin);
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279 else
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280 return -1;
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281 }
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282
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283 #else
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284
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285 __int64
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286 __gnat_ftell64 (FILE *stream)
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287 {
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288 return (__int64)ftell (stream);
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289 }
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290
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291 int
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292 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
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293 {
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294 /* make sure that the offset is not bigger than the OS off_t, if so return
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295 with error as this mean that we are trying to handle files larger than
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296 2Gb on a patform not supporting it. */
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297 if ((off_t)offset == offset)
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298 return fseek (stream, (off_t) offset, origin);
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299 else
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300 return -1;
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301 }
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302 #endif
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303
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304 /* Returns true if the path names a fifo (i.e. a named pipe). */
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305 int
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306 __gnat_is_fifo (const char* path)
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307 {
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308 /* Posix defines S_ISFIFO as a macro. If the macro doesn't exist, we return
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309 false. */
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310 #ifdef S_ISFIFO
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311 struct stat buf;
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312 const int status = stat(path, &buf);
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313 if (status == 0)
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314 return S_ISFIFO(buf.st_mode);
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315 #endif
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316
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317 /* S_ISFIFO is not available, or stat got an error (probably
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318 file not found). */
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319 return 0;
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320 }
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321
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322 #ifdef __cplusplus
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323 }
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324 #endif
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