1 | /**************************************************************************
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2 | *
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3 | * utils.c -- Functions which are common utilities for the image programs
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4 | * Copyright (C) 1994 Stuart Inglis
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program 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 this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | * $Id: utils.c 25147 2012-02-28 00:59:00Z kjdon $
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21 | *
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22 | **************************************************************************/
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23 |
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24 | #include "sysfuncs.h"
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25 |
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26 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
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27 |
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28 | #include "utils.h"
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29 |
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30 |
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31 | int V = 0;
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32 |
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33 |
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34 | int
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35 | isEOF (FILE * fp)
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36 | {
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37 | int ch;
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38 |
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39 | ch = getc (fp);
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40 | ungetc (ch, fp);
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41 | if (ch == EOF)
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42 | return 1;
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43 | return 0;
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44 | }
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45 |
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46 |
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47 | int
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48 | getmagicno_short (FILE * fp)
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49 | {
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50 | int ch1, ch2;
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51 | ch1 = getc (fp);
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52 | if (ch1 == EOF)
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53 | {
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54 | ungetc (ch1, fp);
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55 | return 0;
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56 | }
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57 | ch2 = getc (fp);
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58 | if (ch2 == EOF)
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59 | {
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60 | ungetc (ch2, fp);
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61 | return 0;
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62 | }
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63 | ungetc (ch2, fp);
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64 | ungetc (ch1, fp);
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65 |
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66 | return ((ch1 << 8) | ch2);
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67 | }
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68 |
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69 | int
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70 | getmagicno_short_pop (FILE * fp)
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71 | {
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72 | int ch1, ch2;
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73 | ch1 = getc (fp);
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74 | if (ch1 == EOF)
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75 | return 0;
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76 | ch2 = getc (fp);
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77 | if (ch2 == EOF)
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78 | return 0;
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79 |
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80 | return ((ch1 << 8) | ch2);
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81 | }
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82 |
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83 | int
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84 | getmagicno_byte (FILE * fp)
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85 | {
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86 | int ch1;
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87 | ch1 = getc (fp);
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88 | if (ch1 == EOF)
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89 | {
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90 | ungetc (ch1, fp);
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91 | return 0;
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92 | }
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93 | ungetc (ch1, fp);
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94 | return (ch1);
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95 | }
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96 |
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97 |
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98 | int
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99 | getmagicno_long (FILE * fp)
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100 | {
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101 | int ch1, ch2, ch3, ch4;
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102 | ch1 = getc (fp);
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103 | if (ch1 == EOF)
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104 | {
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105 | ungetc (ch1, fp);
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106 | return 0;
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107 | }
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108 | ch2 = getc (fp);
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109 | if (ch2 == EOF)
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110 | {
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111 | ungetc (ch2, fp);
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112 | return 0;
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113 | }
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114 | ch3 = getc (fp);
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115 | if (ch3 == EOF)
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116 | {
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117 | ungetc (ch3, fp);
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118 | return 0;
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119 | }
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120 | ch4 = getc (fp);
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121 | if (ch4 == EOF)
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122 | {
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123 | ungetc (ch4, fp);
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124 | return 0;
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125 | }
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126 | ungetc (ch4, fp);
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127 | ungetc (ch3, fp);
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128 | ungetc (ch2, fp);
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129 | ungetc (ch1, fp);
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130 |
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131 | return ((ch1 << 24) | (ch2 << 16) | (ch3 << 8) | (ch4));
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132 | }
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133 |
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134 |
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135 |
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136 |
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137 | void
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138 | error_msg (char *prog, char *message, char *extra)
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139 | {
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140 | fprintf (stderr, "%s: %s %s\n", prog, message, extra);
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141 | exit (1);
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142 | }
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143 |
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144 | void
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145 | warn (char *prog, char *message, char *extra)
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146 | {
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147 | fprintf (stderr, "%s: %s %s\n", prog, message, extra);
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148 | }
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149 |
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150 |
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151 |
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152 | void
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153 | readline (char str[], FILE * fp)
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154 | {
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155 | int i = 0, ch;
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156 |
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157 | while (((ch = fgetc (fp)) != '\n') && (!feof (fp)))
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158 | str[i++] = ch;
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159 | str[i] = '\0';
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160 | }
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161 |
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162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 | int
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169 | getint (FILE * fp)
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170 | {
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171 | register char ch;
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172 | register unsigned int i = 0;
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173 |
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174 | do
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175 | {
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176 | ch = getc (fp);
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177 | if (feof (fp))
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178 | return EOF;
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179 | }
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180 | while (ch < '0' || ch > '9');
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181 |
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182 | do
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183 | {
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184 | i = i * 10 + ch - '0';
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185 | ch = getc (fp);
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186 | if (feof (fp))
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187 | return EOF;
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188 | }
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189 | while (ch >= '0' && ch <= '9');
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190 |
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191 | return i;
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192 | }
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193 |
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194 | /* get_header_int i.e. get an integer from a PNM header ; basically
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195 | the same as
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196 | above except for comment checking ; above kept because of lower
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197 | overhead */
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198 |
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199 | unsigned int
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200 | gethint (FILE * fp)
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201 | {
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202 | register char ch, prev = '\0';
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203 | register unsigned int i = 0;
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204 |
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205 | do
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206 | {
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207 | ch = getc (fp);
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208 | if ((ch == '#') && (prev == '\n'))
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209 | while (((ch = getc (fp)) != '\n') && !(feof (fp)));
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210 | prev = ch;
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211 | if (feof (fp))
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212 | return EOF;
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213 | }
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214 | while (ch < '0' || ch > '9');
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215 |
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216 | do
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217 | {
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218 | i = i * 10 + ch - '0';
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219 | ch = getc (fp);
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220 | if (feof (fp))
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221 | return EOF;
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222 | }
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223 | while (ch >= '0' && ch <= '9');
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224 |
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225 | return i;
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226 | }
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227 |
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228 |
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229 |
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230 |
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231 | void
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232 | magic_write (FILE * fp, mg_u_long magic_num)
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233 | {
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234 | HTONUL(magic_num); /* [RPAP - Jan 97: Endian Ordering] */
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235 | if (fwrite (&magic_num, sizeof (magic_num), 1, fp) != 1)
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236 | error_msg ("magic num", "Couldn't write magic number.", "");
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237 | }
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238 |
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239 |
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240 | void
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241 | magic_check (FILE * fp, mg_u_long magic_num)
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242 | {
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243 | mg_u_long magic;
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244 | if (fread (&magic, sizeof (magic), 1, fp) != 1 || NTOHUL(magic) != magic_num) /* [RPAP - Jan 97: Endian Ordering] */
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245 | error_msg ("magic num", "Incorrect magic number.", "");
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246 | }
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247 |
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248 |
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249 | mg_u_long
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250 | magic_read (FILE * fp)
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251 | {
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252 | mg_u_long magic;
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253 | if (fread (&magic, sizeof (magic), 1, fp) != 1)
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254 | error_msg ("magic num", "Couldn't read magic number.", "");
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255 | return NTOHUL(magic); /* [RPAP - Jan 97: Endian Ordering] */
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256 | }
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257 |
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258 |
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259 |
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260 |
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261 | int
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262 | isinteger (char s[])
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263 | {
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264 | int i = 0;
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265 |
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266 | for (i = 0; s[i] != '\0'; i++)
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267 | if (!isdigit (s[i]))
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268 | return 0;
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269 | return 1;
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270 | }
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