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111
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1 /* Implementation of the FGET, FGETC, FPUT, FPUTC, FLUSH
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2 FTELL, TTYNAM and ISATTY intrinsics.
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3 Copyright (C) 2005-2017 Free Software Foundation, Inc.
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4
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5 This file is part of the GNU Fortran runtime library (libgfortran).
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6
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7 Libgfortran is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU General Public
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9 License as published by the Free Software Foundation; either
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10 version 3 of the License, or (at your option) any later version.
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11
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12 Libgfortran is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #include "io.h"
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27 #include "fbuf.h"
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28 #include "unix.h"
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29 #include <string.h>
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30
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31
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32 static const int five = 5;
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33 static const int six = 6;
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34
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35 extern int PREFIX(fgetc) (const int *, char *, gfc_charlen_type);
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36 export_proto_np(PREFIX(fgetc));
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37
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38 int
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39 PREFIX(fgetc) (const int *unit, char *c, gfc_charlen_type c_len)
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40 {
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41 int ret;
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42 gfc_unit *u = find_unit (*unit);
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43
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44 if (u == NULL)
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45 return -1;
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46
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47 fbuf_reset (u);
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48 if (u->mode == WRITING)
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49 {
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50 sflush (u->s);
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51 u->mode = READING;
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52 }
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53
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54 memset (c, ' ', c_len);
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55 ret = sread (u->s, c, 1);
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56 unlock_unit (u);
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57
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58 if (ret < 0)
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59 return ret;
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60
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61 if (ret != 1)
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62 return -1;
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63 else
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64 return 0;
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65 }
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66
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67
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68 #define FGETC_SUB(kind) \
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69 extern void fgetc_i ## kind ## _sub \
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70 (const int *, char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
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71 export_proto(fgetc_i ## kind ## _sub); \
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72 void fgetc_i ## kind ## _sub \
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73 (const int *unit, char *c, GFC_INTEGER_ ## kind *st, gfc_charlen_type c_len) \
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74 { if (st != NULL) \
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75 *st = PREFIX(fgetc) (unit, c, c_len); \
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76 else \
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77 PREFIX(fgetc) (unit, c, c_len); }
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78
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79 FGETC_SUB(1)
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80 FGETC_SUB(2)
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81 FGETC_SUB(4)
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82 FGETC_SUB(8)
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83
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84
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85 extern int PREFIX(fget) (char *, gfc_charlen_type);
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86 export_proto_np(PREFIX(fget));
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87
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88 int
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89 PREFIX(fget) (char *c, gfc_charlen_type c_len)
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90 {
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91 return PREFIX(fgetc) (&five, c, c_len);
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92 }
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93
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94
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95 #define FGET_SUB(kind) \
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96 extern void fget_i ## kind ## _sub \
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97 (char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
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98 export_proto(fget_i ## kind ## _sub); \
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99 void fget_i ## kind ## _sub \
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100 (char *c, GFC_INTEGER_ ## kind *st, gfc_charlen_type c_len) \
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101 { if (st != NULL) \
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102 *st = PREFIX(fgetc) (&five, c, c_len); \
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103 else \
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104 PREFIX(fgetc) (&five, c, c_len); }
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105
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106 FGET_SUB(1)
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107 FGET_SUB(2)
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108 FGET_SUB(4)
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109 FGET_SUB(8)
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110
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111
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112
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113 extern int PREFIX(fputc) (const int *, char *, gfc_charlen_type);
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114 export_proto_np(PREFIX(fputc));
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115
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116 int
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117 PREFIX(fputc) (const int *unit, char *c,
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118 gfc_charlen_type c_len __attribute__((unused)))
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119 {
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120 ssize_t s;
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121 gfc_unit *u = find_unit (*unit);
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122
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123 if (u == NULL)
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124 return -1;
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125
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126 fbuf_reset (u);
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127 if (u->mode == READING)
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128 {
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129 sflush (u->s);
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130 u->mode = WRITING;
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131 }
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132
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133 s = swrite (u->s, c, 1);
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134 unlock_unit (u);
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135 if (s < 0)
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136 return -1;
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137 return 0;
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138 }
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139
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140
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141 #define FPUTC_SUB(kind) \
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142 extern void fputc_i ## kind ## _sub \
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143 (const int *, char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
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144 export_proto(fputc_i ## kind ## _sub); \
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145 void fputc_i ## kind ## _sub \
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146 (const int *unit, char *c, GFC_INTEGER_ ## kind *st, gfc_charlen_type c_len) \
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147 { if (st != NULL) \
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148 *st = PREFIX(fputc) (unit, c, c_len); \
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149 else \
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150 PREFIX(fputc) (unit, c, c_len); }
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151
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152 FPUTC_SUB(1)
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153 FPUTC_SUB(2)
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154 FPUTC_SUB(4)
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155 FPUTC_SUB(8)
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156
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157
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158 extern int PREFIX(fput) (char *, gfc_charlen_type);
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159 export_proto_np(PREFIX(fput));
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160
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161 int
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162 PREFIX(fput) (char *c, gfc_charlen_type c_len)
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163 {
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164 return PREFIX(fputc) (&six, c, c_len);
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165 }
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166
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167
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168 #define FPUT_SUB(kind) \
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169 extern void fput_i ## kind ## _sub \
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170 (char *, GFC_INTEGER_ ## kind *, gfc_charlen_type); \
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171 export_proto(fput_i ## kind ## _sub); \
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172 void fput_i ## kind ## _sub \
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173 (char *c, GFC_INTEGER_ ## kind *st, gfc_charlen_type c_len) \
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174 { if (st != NULL) \
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175 *st = PREFIX(fputc) (&six, c, c_len); \
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176 else \
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177 PREFIX(fputc) (&six, c, c_len); }
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178
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179 FPUT_SUB(1)
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180 FPUT_SUB(2)
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181 FPUT_SUB(4)
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182 FPUT_SUB(8)
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183
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184
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185 /* SUBROUTINE FLUSH(UNIT)
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186 INTEGER, INTENT(IN), OPTIONAL :: UNIT */
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187
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188 extern void flush_i4 (GFC_INTEGER_4 *);
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189 export_proto(flush_i4);
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190
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191 void
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192 flush_i4 (GFC_INTEGER_4 *unit)
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193 {
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194 gfc_unit *us;
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195
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196 /* flush all streams */
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197 if (unit == NULL)
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198 flush_all_units ();
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199 else
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200 {
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201 us = find_unit (*unit);
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202 if (us != NULL)
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203 {
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204 sflush (us->s);
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205 unlock_unit (us);
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206 }
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207 }
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208 }
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209
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210
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211 extern void flush_i8 (GFC_INTEGER_8 *);
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212 export_proto(flush_i8);
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213
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214 void
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215 flush_i8 (GFC_INTEGER_8 *unit)
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216 {
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217 gfc_unit *us;
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218
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219 /* flush all streams */
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220 if (unit == NULL)
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221 flush_all_units ();
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222 else
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223 {
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224 us = find_unit (*unit);
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225 if (us != NULL)
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226 {
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227 sflush (us->s);
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228 unlock_unit (us);
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229 }
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230 }
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231 }
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232
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233 /* FSEEK intrinsic */
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234
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235 extern void fseek_sub (int *, GFC_IO_INT *, int *, int *);
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236 export_proto(fseek_sub);
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237
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238 void
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239 fseek_sub (int *unit, GFC_IO_INT *offset, int *whence, int *status)
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240 {
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241 gfc_unit *u = find_unit (*unit);
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242 ssize_t result = -1;
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243
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244 if (u != NULL)
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245 {
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246 result = sseek(u->s, *offset, *whence);
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247
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248 unlock_unit (u);
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249 }
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250
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251 if (status)
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252 *status = (result < 0 ? -1 : 0);
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253 }
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254
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255
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256
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257 /* FTELL intrinsic */
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258
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259 static gfc_offset
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260 gf_ftell (int unit)
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261 {
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262 gfc_unit *u = find_unit (unit);
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263 if (u == NULL)
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264 return -1;
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265 int pos = fbuf_reset (u);
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266 if (pos != 0)
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267 sseek (u->s, pos, SEEK_CUR);
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268 gfc_offset ret = stell (u->s);
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269 unlock_unit (u);
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270 return ret;
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271 }
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272
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273
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274 extern GFC_IO_INT PREFIX(ftell) (int *);
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275 export_proto_np(PREFIX(ftell));
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276
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277 GFC_IO_INT
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278 PREFIX(ftell) (int *unit)
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279 {
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280 return gf_ftell (*unit);
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281 }
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282
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283
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284 #define FTELL_SUB(kind) \
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285 extern void ftell_i ## kind ## _sub (int *, GFC_INTEGER_ ## kind *); \
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286 export_proto(ftell_i ## kind ## _sub); \
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287 void \
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288 ftell_i ## kind ## _sub (int *unit, GFC_INTEGER_ ## kind *offset) \
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289 { \
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290 *offset = gf_ftell (*unit); \
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291 }
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292
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293 FTELL_SUB(1)
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294 FTELL_SUB(2)
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295 FTELL_SUB(4)
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296 FTELL_SUB(8)
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297
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298
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299
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300 /* LOGICAL FUNCTION ISATTY(UNIT)
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301 INTEGER, INTENT(IN) :: UNIT */
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302
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303 extern GFC_LOGICAL_4 isatty_l4 (int *);
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304 export_proto(isatty_l4);
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305
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306 GFC_LOGICAL_4
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307 isatty_l4 (int *unit)
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308 {
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309 gfc_unit *u;
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310 GFC_LOGICAL_4 ret = 0;
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311
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312 u = find_unit (*unit);
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313 if (u != NULL)
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314 {
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315 ret = (GFC_LOGICAL_4) stream_isatty (u->s);
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316 unlock_unit (u);
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317 }
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318 return ret;
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319 }
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320
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321
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322 extern GFC_LOGICAL_8 isatty_l8 (int *);
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323 export_proto(isatty_l8);
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324
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325 GFC_LOGICAL_8
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326 isatty_l8 (int *unit)
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327 {
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328 gfc_unit *u;
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329 GFC_LOGICAL_8 ret = 0;
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330
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331 u = find_unit (*unit);
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332 if (u != NULL)
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333 {
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334 ret = (GFC_LOGICAL_8) stream_isatty (u->s);
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335 unlock_unit (u);
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336 }
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337 return ret;
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338 }
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339
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340
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341 /* SUBROUTINE TTYNAM(UNIT,NAME)
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342 INTEGER,SCALAR,INTENT(IN) :: UNIT
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343 CHARACTER,SCALAR,INTENT(OUT) :: NAME */
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344
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345 extern void ttynam_sub (int *, char *, gfc_charlen_type);
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346 export_proto(ttynam_sub);
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347
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348 void
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349 ttynam_sub (int *unit, char *name, gfc_charlen_type name_len)
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350 {
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351 gfc_unit *u;
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352 int nlen;
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353 int err = 1;
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354
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355 u = find_unit (*unit);
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356 if (u != NULL)
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357 {
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358 err = stream_ttyname (u->s, name, name_len);
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359 if (err == 0)
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360 {
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361 nlen = strlen (name);
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362 memset (&name[nlen], ' ', name_len - nlen);
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363 }
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364
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365 unlock_unit (u);
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366 }
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367 if (err != 0)
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368 memset (name, ' ', name_len);
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369 }
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370
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371
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372 extern void ttynam (char **, gfc_charlen_type *, int);
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373 export_proto(ttynam);
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374
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375 void
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376 ttynam (char **name, gfc_charlen_type *name_len, int unit)
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377 {
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378 gfc_unit *u;
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379
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380 u = find_unit (unit);
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381 if (u != NULL)
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382 {
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383 *name = xmalloc (TTY_NAME_MAX);
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384 int err = stream_ttyname (u->s, *name, TTY_NAME_MAX);
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385 if (err == 0)
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386 {
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387 *name_len = strlen (*name);
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388 unlock_unit (u);
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389 return;
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390 }
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391 free (*name);
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392 unlock_unit (u);
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393 }
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394
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395 *name_len = 0;
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396 *name = NULL;
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397 }
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