FreeCalypso > hg > themwi-system-sw

annotate sip-in/readconf.c @ 90:736c2d68595f

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sip-in/readconf.c: second step toward non-trivial settings
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 23 Sep 2022 18:53:35 -0800
parents e64d4d44025d
children fd23e2747b45
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47
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1 /*
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2 * In this module we implement the reading of /var/gsm/themwi-sip-in.cfg:
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3 * the main settings are bind-ip and bind-port, but we also have some
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4 * optional config settings.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.h>
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9 #include <netinet/in.h>
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10 #include <arpa/inet.h>
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11 #include <ctype.h>
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12 #include <stdio.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16
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17 struct in_addr sip_bind_ip;
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18 unsigned sip_bind_port;
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19 int cfg_use_100rel;
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20 unsigned cfg_retrans_timeout = 500;
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21 unsigned cfg_retrans_count = 10;
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22
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23 static char config_file_pathname[] = "/var/gsm/themwi-sip-in.cfg";
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24
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25 struct parse_state {
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26 int lineno;
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27 int set_mask;
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28 };
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29
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30 static void
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31 require_one_arg(st, kw, arg)
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32 struct parse_state *st;
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33 char *kw, *arg;
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34 {
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35 char *cp;
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36
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37 if (*arg == '\0' || *arg == '#') {
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38 inv_syntax: fprintf(stderr,
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39 "%s line %d: %s setting requires one argument\n",
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40 config_file_pathname, st->lineno, kw);
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41 exit(1);
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42 }
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43 for (cp = arg; *cp && !isspace(*cp); cp++)
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44 ;
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45 if (*cp)
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46 *cp++ = '\0';
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47 while (isspace(*cp))
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48 cp++;
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49 if (*cp != '\0' && *cp != '#')
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50 goto inv_syntax;
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51 }
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52
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53 static void
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54 handle_ip(st, kw, arg, var)
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55 struct parse_state *st;
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56 char *kw, *arg;
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57 struct in_addr *var;
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58 {
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59 require_one_arg(st, kw, arg);
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60 var->s_addr = inet_addr(arg);
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61 if (var->s_addr == INADDR_NONE) {
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62 fprintf(stderr,
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63 "%s line %d: invalid IP address argument \"%s\"\n",
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64 config_file_pathname, st->lineno, arg);
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65 exit(1);
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66 }
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67 }
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68
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69 static void
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70 handle_num(st, kw, arg, var)
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71 struct parse_state *st;
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72 char *kw, *arg;
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73 unsigned *var;
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74 {
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75 char *endp;
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76
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77 require_one_arg(st, kw, arg);
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78 *var = strtoul(arg, &endp, 10);
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79 if (*endp) {
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80 fprintf(stderr, "%s line %d: invalid numeric argument \"%s\"\n",
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81 config_file_pathname, st->lineno, arg);
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82 exit(1);
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83 }
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84 }
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85
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86 static void
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87 handle_bool(st, kw, arg, var)
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88 struct parse_state *st;
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89 char *kw, *arg;
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90 int *var;
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91 {
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92 require_one_arg(st, kw, arg);
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93 if (!strcmp(arg, "true") || !strcmp(arg, "on") || !strcmp(arg, "yes")
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94 || !strcmp(arg, "1")) {
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95 *var = 1;
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96 return;
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97 }
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98 if (!strcmp(arg, "false") || !strcmp(arg, "off") || !strcmp(arg, "no")
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99 || !strcmp(arg, "0")) {
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100 *var = 0;
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101 return;
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102 }
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103 fprintf(stderr, "%s line %d: invalid boolean argument \"%s\"\n",
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104 config_file_pathname, st->lineno, arg);
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105 exit(1);
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106 }
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107
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108 static void
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109 process_line(st, line)
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110 struct parse_state *st;
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111 char *line;
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112 {
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113 char *cp, *kw;
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114 void (*handler)(), *var;
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115 int set_id;
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116
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117 if (!index(line, '\n')) {
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118 fprintf(stderr, "%s line %d: too long or missing newline\n",
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119 config_file_pathname, st->lineno);
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120 exit(1);
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121 }
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122 for (cp = line; isspace(*cp); cp++)
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123 ;
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124 if (*cp == '\0' || *cp == '#')
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125 return;
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126 for (kw = cp; *cp && !isspace(*cp); cp++)
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127 ;
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128 if (*cp)
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129 *cp++ = '\0';
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130 if (!strcmp(kw, "bind-ip")) {
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131 handler = handle_ip;
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132 var = &sip_bind_ip;
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133 set_id = 1;
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134 } else if (!strcmp(kw, "bind-port")) {
47
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135 handler = handle_num;
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136 var = &sip_bind_port;
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137 set_id = 2;
89
e64d4d44025d sip-in/readconf.c: first step toward non-trivial settings
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138 } else if (!strcmp(kw, "use-100rel")) {
47
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139 handler = handle_bool;
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140 var = &cfg_use_100rel;
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parents:
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141 set_id = 0;
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142 } else {
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143 fprintf(stderr, "%s line %d: non-understood keyword \"%s\"\n",
89
e64d4d44025d sip-in/readconf.c: first step toward non-trivial settings
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parents: 68
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144 config_file_pathname, st->lineno, kw);
47
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145 exit(1);
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146 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 if (st->set_mask & set_id) {
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parents:
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148 fprintf(stderr, "%s line %d: duplicate %s setting\n",
89
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parents: 68
diff changeset
149 config_file_pathname, st->lineno, kw);
47
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150 exit(1);
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parents:
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151 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 while (isspace(*cp))
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153 cp++;
90
736c2d68595f sip-in/readconf.c: second step toward non-trivial settings
Mychaela Falconia <falcon@freecalypso.org>
parents: 89
diff changeset
154 handler(st, kw, cp, var);
47
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155 st->set_mask |= set_id;
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156 }
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157
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158 read_config_file()
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parents:
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159 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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160 FILE *inf;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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161 struct parse_state pst;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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162 char linebuf[256];
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parents:
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163
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164 inf = fopen(config_file_pathname, "r");
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parents:
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165 if (!inf) {
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parents:
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166 perror(config_file_pathname);
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parents:
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167 exit(1);
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parents:
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168 }
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parents:
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169 pst.set_mask = 0;
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170 for (pst.lineno = 1; fgets(linebuf, sizeof linebuf, inf); pst.lineno++)
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parents:
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171 process_line(&pst, linebuf);
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parents:
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172 fclose(inf);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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173 if (pst.set_mask != 3) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 fprintf(stderr, "error: %s did not set all required settings\n",
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parents:
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175 config_file_pathname);
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parents:
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176 exit(1);
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parents:
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177 }
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178 }