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annotate toys/toysh.c @ 3:266a462ed18c

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Next drop of toysh, plus more infratructure.
author landley@driftwood
date Wed, 18 Oct 2006 18:38:16 -0400
parents 67b517913e56
children fc9c0503d5e2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * toysh - toybox shell
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4 *
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5 * Copyright 2006 Rob Landley <rob@landley.net>
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6 *
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7 * The spec for this is at:
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8 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
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9 *
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10 * Although things like the bash man page are good to read too.
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11 */
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12
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13 // Handle embedded NUL bytes in the command line.
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14
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15 #include "toys.h"
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16
3
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17 // A single executable, its arguments, and other information we know about it.
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18 #define TOYSH_FLAG_EXIT 1
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19 #define TOYSH_FLAG_SUSPEND 2
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20 #define TOYSH_FLAG_PIPE 4
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21 #define TOYSH_FLAG_AND 8
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22 #define TOYSH_FLAG_OR 16
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23 #define TOYSH_FLAG_AMP 32
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24 #define TOYSH_FLAG_SEMI 64
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25 #define TOYSH_FLAG_PAREN 128
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26
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27 // What we know about a single process.
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28 struct command {
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29 struct command *next;
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30 int flags; // exit, suspend, && ||
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31 int pid; // pid (or exit code)
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32 int argc;
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33 char *argv[0];
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34 };
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35
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36 // A collection of processes piped into/waiting on each other.
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37 struct pipeline {
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38 struct pipeline *next;
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39 int job_id;
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40 struct command *cmd;
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41 char *cmdline; // Unparsed line for display purposes
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42 int cmdlinelen; // How long is cmdline?
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43 };
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44
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45 // Parse one word from the command line, appending one or more argv[] entries
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46 // to struct command. Handles environment variable substitution and
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47 // substrings. Returns pointer to next used byte, or NULL if it
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48 // hit an ending token.
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49 static char *parse_word(char *start, struct command **cmd)
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50 {
3
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51 char *end;
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52
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53 // Detect end of line (and truncate line at comment)
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54 if (CFG_TOYSH_PIPES && strchr("><&|(;", *start)) return 0;
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55
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56 // Grab next word. (Add dequote and envvar logic here)
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57 end = start;
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58 while (*end && !isspace(*end)) end++;
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59 (*cmd)->argv[(*cmd)->argc++] = xstrndup(start, end-start);
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60
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61 // Allocate more space if there's no room for NULL terminator.
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62
3
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63 if (!((*cmd)->argc & 7))
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64 xrealloc((void **)cmd,
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65 sizeof(struct command) + ((*cmd)->argc+8)*sizeof(char *));
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66 (*cmd)->argv[(*cmd)->argc] = 0;
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67 return end;
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68 }
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69
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70 // Parse a line of text into a pipeline.
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71 // Returns a pointer to the next line.
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72
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73 static char *parse_pipeline(char *cmdline, struct pipeline *line)
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74 {
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75 struct command **cmd = &(line->cmd);
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76 char *start = line->cmdline = cmdline;
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77
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78 if (!cmdline) return 0;
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79
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80 if (CFG_TOYSH_JOBCTL) line->cmdline = cmdline;
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81
2
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82 // Parse command into argv[]
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83 for (;;) {
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84 char *end;
3
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85
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86 // Skip leading whitespace and detect end of line.
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87 while (isspace(*start)) start++;
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88 if (!*start || *start=='#') {
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89 if (CFG_TOYSH_JOBCTL) line->cmdlinelen = start-cmdline;
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90 return 0;
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91 }
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92
3
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93 // Allocate next command structure if necessary
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94 if (!*cmd) *cmd = xzalloc(sizeof(struct command)+8*sizeof(char *));
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95
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96 // Parse next argument and add the results to argv[]
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97 end = parse_word(start, cmd);
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98
3
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99 // If we hit the end of this command, how did it end?
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100 if (!end) {
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101 if (CFG_TOYSH_PIPES && *start) {
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102 if (*start==';') {
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103 start++;
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104 break;
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105 }
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106 // handle | & < > >> << || &&
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107 }
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108 break;
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109 }
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110 start = end;
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111 }
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112
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113 if (CFG_TOYSH_JOBCTL) line->cmdlinelen = start-cmdline;
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114
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115 return start;
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116 }
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117
3
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118 // Execute the commands in a pipeline
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119 static void run_pipeline(struct pipeline *line)
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120 {
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121 struct toy_list *tl;
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122 struct command *cmd = line->cmd;
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123 if (!cmd || !cmd->argc) return;
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124
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125 tl = toy_find(cmd->argv[0]);
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126 // Is this command a builtin that should run in this process?
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127 if (tl && (tl->flags & TOYFLAG_NOFORK)) {
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128 struct toy_list *which = toys.which;
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129 char **argv = toys.argv;
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130
3
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131 toy_init(tl, cmd->argv);
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132 cmd->pid = tl->toy_main();
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133 toy_init(which, argv);
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134 } else {
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135 int status;
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136
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137 cmd->pid = vfork();
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138 if (!cmd->pid) xexec(cmd->argv);
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139 else waitpid(cmd->pid, &status, 0);
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140
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141 if (CFG_TOYSH_FLOWCTL || CFG_TOYSH_PIPES) {
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142 if (WIFEXITED(status)) cmd->pid = WEXITSTATUS(status);
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143 if (WIFSIGNALED(status)) cmd->pid = WTERMSIG(status);
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144 }
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145 }
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146
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147 return;
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148 }
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149
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150 // Free the contents of a command structure
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151 static void free_cmd(void *data)
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152 {
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153 struct command *cmd=(struct command *)data;
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154
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155 while(cmd->argc) free(cmd->argv[--cmd->argc]);
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156 }
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157
2
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158
3
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159 // Parse a command line and do what it says to do.
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160 static void handle(char *command)
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161 {
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162 struct pipeline line;
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163 char *start = command;
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164
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165 // Loop through commands in this line
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166
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167 for (;;) {
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168
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169 // Parse a group of connected commands
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170
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171 memset(&line,0,sizeof(struct pipeline));
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172 start = parse_pipeline(start, &line);
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173 if (!line.cmd) break;
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174
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175 // Run those commands
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176
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177 run_pipeline(&line);
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178 llist_free(line.cmd, free_cmd);
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179 }
2
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180 }
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181
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182 int cd_main(void)
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183 {
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184 char *dest = toys.argc>1 ? toys.argv[1] : getenv("HOME");
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185 if (chdir(dest)) error_exit("chdir %s",dest);
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186 return 0;
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187 }
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188
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189 int exit_main(void)
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190 {
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191 exit(toys.argc>1 ? atoi(toys.argv[1]) : 0);
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192 }
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193
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194 int toysh_main(void)
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195 {
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196 char *command=NULL;
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197 FILE *f;
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198
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199 // TODO get_optflags(argv, "c:", &command);
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200
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201 f = toys.argv[1] ? xfopen(toys.argv[1], "r") : NULL;
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202 if (command) handle(command);
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203 else {
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204 unsigned cmdlen=0;
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205 for (;;) {
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206 if (!f) putchar('$');
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207 if (1 > getline(&command, &cmdlen, f ? : stdin)) break;
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208 handle(command);
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209 }
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210 if (CFG_TOYS_FREE) free(command);
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211 }
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212
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213 return 1;
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214 }