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annotate Python/pythonmain.c @ 1848:b724599401ff legacy-trunk

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Merge back to main trunk
author Guido van Rossum <guido@python.org>
date Tue, 30 Aug 1994 08:27:36 +0000
parents c914b10bf2ed
children 35947f60528e
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1 /***********************************************************
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2 Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
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3 Amsterdam, The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Python interpreter main program */
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26
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27 #include "allobjects.h"
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28
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29 extern int debugging; /* Needed in parser.c, declared in pythonrun.c */
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30 extern int verbose; /* Needed in import.c, declared in pythonrun.c */
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31 extern int suppress_print; /* Needed in ceval.c, declared in pythonrun.c */
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32
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33 /* Interface to getopt(): */
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34 extern int optind;
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35 extern char *optarg;
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36 extern int getopt(); /* PROTO((int, char **, char *)); -- not standardized */
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37
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38 extern char *getenv();
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39
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40 extern char *getversion();
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41 extern char *getcopyright();
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42
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43 int
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44 realmain(argc, argv)
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45 int argc;
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46 char **argv;
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47 {
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48 int c;
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49 int sts;
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50 char *command = NULL;
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51 char *filename = NULL;
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52 FILE *fp = stdin;
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53 char *p;
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54 int inspect = 0;
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55 int unbuffered = 0;
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56
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57 if ((p = getenv("PYTHONDEBUG")) && *p != '\0')
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58 debugging = 1;
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59 if ((p = getenv("PYTHONSUPPRESS")) && *p != '\0')
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60 suppress_print = 1;
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61 if ((p = getenv("PYTHONVERBOSE")) && *p != '\0')
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62 verbose = 1;
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63 if ((p = getenv("PYTHONINSPECT")) && *p != '\0')
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64 inspect = 1;
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65 if ((p = getenv("PYTHONUNBUFFERED")) && *p != '\0')
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66 unbuffered = 1;
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67
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68 while ((c = getopt(argc, argv, "c:disuv")) != EOF) {
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69 if (c == 'c') {
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70 /* -c is the last option; following arguments
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71 that look like options are left for the
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72 the command to interpret. */
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73 command = malloc(strlen(optarg) + 2);
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74 /* Ignore malloc errors this early... */
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75 strcpy(command, optarg);
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76 strcat(command, "\n");
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77 break;
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78 }
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79
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80 switch (c) {
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81
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82 case 'd':
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83 debugging++;
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84 break;
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85
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86 case 'i':
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87 inspect++;
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88 break;
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89
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90 case 's':
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91 suppress_print++;
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92 break;
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93
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94 case 'u':
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95 unbuffered++;
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96 break;
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97
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98 case 'v':
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99 verbose++;
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100 break;
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101
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102 /* This space reserved for other options */
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103
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104 default:
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105 fprintf(stderr,
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106 "usage: %s [-d] [-i] [-s] [-u ] [-v] [-c cmd | file | -] [arg] ...\n",
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107 argv[0]);
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108 fprintf(stderr, "\
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109 \n\
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110 Options and arguments (and corresponding environment variables):\n\
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111 -d : debug output from parser (also PYTHONDEBUG=x)\n\
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112 -i : inspect interactively after running script (also PYTHONINSPECT=x)\n\
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113 -s : suppress the printing of top level expressions (also PYTHONSUPPRESS=x)\n\
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114 -u : unbuffered stdout and stderr (also PYTHONUNBUFFERED=x)\n\
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115 -v : verbose (trace import statements) (also PYTHONVERBOSE=x)\n\
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116 -c cmd : program passed in as string (terminates option list)\n\
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117 ");
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118 /* ANSI does not allow strings > 512 chars
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119 and MPW doesn't like it either -- so split it! */
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120 fprintf(stderr, "\
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121 file : program read from script file\n\
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122 - : program read from stdin (default; interactive mode if a tty)\n\
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123 arg ...: arguments passed to program in sys.argv[1:]\n\
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124 \n\
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125 Other environment variables:\n\
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126 PYTHONSTARTUP: file executed on interactive startup (no default)\n\
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127 PYTHONPATH : colon-separated list of directories prefixed to the\n\
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128 default module search path. The result is sys.path.\n\
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129 ");
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130 exit(2);
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131 /*NOTREACHED*/
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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 if (unbuffered) {
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137 #ifndef MPW
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138 setbuf(stdout, (char *)NULL);
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139 setbuf(stderr, (char *)NULL);
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140 #else
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141 /* On MPW (3.2) unbuffered seems to hang */
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142 setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
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143 setvbuf(stderr, (char *)NULL, _IOLBF, BUFSIZ);
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144 #endif
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145 }
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146
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147 if (command == NULL && optind < argc && strcmp(argv[optind], "-") != 0)
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148 filename = argv[optind];
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149
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150 if (verbose ||
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151 command == NULL && filename == NULL && isatty((int)fileno(fp)))
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152 fprintf(stderr, "Python %s\n%s\n",
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153 getversion(), getcopyright());
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154
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155 if (filename != NULL) {
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156 if ((fp = fopen(filename, "r")) == NULL) {
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157 fprintf(stderr, "%s: can't open file '%s'\n",
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158 argv[0], filename);
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159 exit(2);
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160 }
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161 }
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162
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163 initall();
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164
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165 if (command != NULL) {
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166 /* Backup optind and force sys.argv[0] = '-c' */
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167 optind--;
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168 argv[optind] = "-c";
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169 }
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170
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171 setpythonargv(argc-optind, argv+optind);
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172
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173 if (command) {
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174 sts = run_command(command) != 0;
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175 }
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176 else {
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177 if (filename == NULL && isatty((int)fileno(fp))) {
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178 char *startup = getenv("PYTHONSTARTUP");
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179 #ifdef macintosh
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180 if (startup == NULL)
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181 startup = "PythonStartup";
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182 #endif
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183 if (startup != NULL && startup[0] != '\0') {
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184 FILE *fp = fopen(startup, "r");
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185 if (fp != NULL) {
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186 (void) run_script(fp, startup);
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187 err_clear();
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188 fclose(fp);
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189 }
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190 }
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191 }
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192 sts = run(fp, filename == NULL ? "<stdin>" : filename) != 0;
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193 if (filename != NULL)
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194 fclose(fp);
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195 }
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196
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197 if (inspect && isatty((int)fileno(stdin)) &&
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198 (filename != NULL || command != NULL))
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199 sts = run(stdin, "<stdin>") != 0;
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200
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201 goaway(sts);
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202 /*NOTREACHED*/
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203 }