[dd74e612] | 1 | /* |
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| 2 | * |
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| 3 | * Instantatiate a new terminal shell. |
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| 4 | * |
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| 5 | * Author: |
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| 6 | * |
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| 7 | * WORK: fernando.ruiz@ctv.es |
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| 8 | * HOME: correo@fernando-ruiz.com |
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| 9 | * |
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| 10 | * Thanks at: |
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| 11 | * Chris John |
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| 12 | * |
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| 13 | * $Id$ |
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| 14 | */ |
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| 15 | |
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| 16 | #undef __STRICT_ANSI__ /* fileno() */ |
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| 17 | #include <stdio.h> |
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| 18 | |
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| 19 | #include <rtems.h> |
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| 20 | #include <rtems/error.h> |
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| 21 | #include <rtems/libio.h> |
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| 22 | #include <rtems/libio_.h> |
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| 23 | |
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| 24 | #include <termios.h> |
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| 25 | #include <string.h> |
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| 26 | #include <stdlib.h> |
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| 27 | #include <ctype.h> |
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| 28 | #include <unistd.h> |
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| 29 | #include <errno.h> |
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| 30 | |
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| 31 | #include <rtems/shell.h> |
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| 32 | /* ----------------------------------------------- * |
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| 33 | * This is a stupidity but is cute. |
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| 34 | * ----------------------------------------------- */ |
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| 35 | rtems_unsigned32 new_rtems_name(char * rtems_name) { |
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| 36 | static char b[5]; |
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| 37 | sprintf(b,"%-4.4s",rtems_name); |
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| 38 | return rtems_build_name(b[0],b[1],b[2],b[3]); |
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| 39 | } |
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| 40 | /* ************************************************************** |
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| 41 | * common linked list of shell commands. |
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| 42 | * Because the help report is very long |
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| 43 | * I have a topic for each command. |
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| 44 | * Help list the topics |
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| 45 | * help [topic] list the commands for the topic |
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| 46 | * help [command] help for the command |
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| 47 | * Can you see help rtems monitor report? |
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| 48 | * ************************************************************** */ |
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| 49 | |
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| 50 | struct shell_topic_tt; |
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| 51 | typedef struct shell_topic_tt shell_topic_t; |
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| 52 | |
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| 53 | struct shell_topic_tt { |
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| 54 | char * topic; |
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| 55 | shell_topic_t * next; |
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| 56 | }; |
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| 57 | |
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| 58 | |
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| 59 | static shell_cmd_t * shell_first_cmd; |
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| 60 | static shell_topic_t * shell_first_topic; |
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| 61 | /* ----------------------------------------------- * |
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| 62 | * Using Chain I can reuse the rtems code. |
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| 63 | * I am more comfortable with this, sorry. |
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| 64 | * ----------------------------------------------- */ |
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| 65 | shell_topic_t * shell_lookup_topic(char * topic) { |
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| 66 | shell_topic_t * shell_topic; |
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| 67 | shell_topic=shell_first_topic; |
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| 68 | while (shell_topic) { |
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| 69 | if (!strcmp(shell_topic->topic,topic)) return shell_topic; |
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| 70 | shell_topic=shell_topic->next; |
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| 71 | }; |
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| 72 | return (shell_topic_t *) NULL; |
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| 73 | } |
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| 74 | /* ----------------------------------------------- */ |
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| 75 | shell_topic_t * shell_add_topic(char * topic) { |
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| 76 | shell_topic_t * current,*aux; |
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| 77 | if (!shell_first_topic) { |
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| 78 | aux=malloc(sizeof(shell_topic_t)); |
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| 79 | aux->topic=topic; |
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| 80 | aux->next=(shell_topic_t*)NULL; |
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| 81 | return shell_first_topic=aux; |
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| 82 | } else { |
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| 83 | current=shell_first_topic; |
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| 84 | if (!strcmp(topic,current->topic)) return current; |
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| 85 | while (current->next) { |
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| 86 | if (!strcmp(topic,current->next->topic)) return current->next; |
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| 87 | current=current->next; |
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| 88 | }; |
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| 89 | aux=malloc(sizeof(shell_topic_t)); |
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| 90 | aux->topic=topic; |
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| 91 | aux->next=(shell_topic_t*)NULL; |
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| 92 | current->next=aux; |
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| 93 | return aux; |
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| 94 | }; |
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| 95 | } |
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| 96 | /* ----------------------------------------------- */ |
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| 97 | shell_cmd_t * shell_lookup_cmd(char * cmd) { |
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| 98 | shell_cmd_t * shell_cmd; |
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| 99 | shell_cmd=shell_first_cmd; |
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| 100 | while (shell_cmd) { |
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| 101 | if (!strcmp(shell_cmd->name,cmd)) return shell_cmd; |
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| 102 | shell_cmd=shell_cmd->next; |
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| 103 | }; |
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| 104 | return (shell_cmd_t *) NULL; |
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| 105 | } |
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| 106 | /* ----------------------------------------------- */ |
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| 107 | shell_cmd_t * shell_add_cmd(char * cmd, |
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| 108 | char * topic, |
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| 109 | char * usage, |
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| 110 | shell_command_t command) { |
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| 111 | int shell_help(int argc,char * argv[]); |
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| 112 | shell_cmd_t * shell_cmd,*shell_pvt; |
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| 113 | if (!shell_first_cmd) { |
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| 114 | shell_first_cmd=(shell_cmd_t *) malloc(sizeof(shell_cmd_t)); |
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| 115 | shell_first_cmd->name ="help"; |
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| 116 | shell_first_cmd->topic ="help"; |
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| 117 | shell_first_cmd->usage ="help [topic] # list of usage of commands"; |
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| 118 | shell_first_cmd->command=shell_help; |
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| 119 | shell_first_cmd->alias =(shell_cmd_t *) NULL; |
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| 120 | shell_first_cmd->next =(shell_cmd_t *) NULL; |
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| 121 | shell_add_topic(shell_first_cmd->topic); |
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| 122 | register_cmds(); |
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| 123 | }; |
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| 124 | if (!cmd) return (shell_cmd_t *) NULL; |
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| 125 | if (!command) return (shell_cmd_t *) NULL; |
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| 126 | shell_cmd=(shell_cmd_t *) malloc(sizeof(shell_cmd_t)); |
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| 127 | shell_cmd->name =cmd; |
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| 128 | shell_cmd->topic =topic; |
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| 129 | shell_cmd->usage =usage; |
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| 130 | shell_cmd->command=command; |
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| 131 | shell_cmd->alias =(shell_cmd_t *) NULL; |
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| 132 | shell_cmd->next =(shell_cmd_t *) NULL; |
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| 133 | shell_add_topic(shell_cmd->topic); |
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| 134 | shell_pvt=shell_first_cmd; |
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| 135 | while (shell_pvt->next) shell_pvt=shell_pvt->next; |
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| 136 | return shell_pvt->next=shell_cmd; |
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| 137 | } |
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| 138 | /* ----------------------------------------------- * |
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| 139 | * you can make an alias for every command. |
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| 140 | * ----------------------------------------------- */ |
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| 141 | shell_cmd_t * shell_alias_cmd(char * cmd, char * alias) { |
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| 142 | shell_cmd_t * shell_cmd,* shell_aux; |
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| 143 | shell_aux=(shell_cmd_t *) NULL; |
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| 144 | if (alias) { |
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| 145 | if ((shell_aux=shell_lookup_cmd(alias))!=NULL) { |
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| 146 | return NULL; |
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| 147 | }; |
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| 148 | if ((shell_cmd=shell_lookup_cmd(cmd))!=NULL) { |
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| 149 | shell_aux=shell_add_cmd(alias,shell_cmd->topic, |
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| 150 | shell_cmd->usage,shell_cmd->command); |
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| 151 | if (shell_aux) shell_aux->alias=shell_cmd; |
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| 152 | }; |
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| 153 | }; |
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| 154 | return shell_aux; |
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| 155 | } |
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| 156 | /* ----------------------------------------------- * |
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| 157 | * Poor but enough.. |
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| 158 | * TODO: Redirection capture. "" evaluate, ... C&S welcome. |
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| 159 | * ----------------------------------------------- */ |
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| 160 | int shell_make_args(char * cmd, |
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| 161 | int * pargc, |
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| 162 | char * argv[]) { |
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| 163 | int argc=0; |
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| 164 | while ((cmd=strtok(cmd," \t\r\n"))!=NULL) { |
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| 165 | argv[argc++]=cmd; |
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| 166 | cmd=(char*)NULL; |
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| 167 | }; |
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| 168 | argv[argc]=(char*)NULL; |
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| 169 | return *pargc=argc; |
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| 170 | } |
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| 171 | /* ----------------------------------------------- * |
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| 172 | * show the help for one command. |
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| 173 | * ----------------------------------------------- */ |
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| 174 | int shell_help_cmd(shell_cmd_t * shell_cmd) { |
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| 175 | char * pc; |
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| 176 | int col,line; |
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| 177 | printf("%-10.10s -",shell_cmd->name); |
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| 178 | col=12; |
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| 179 | line=1; |
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| 180 | if (shell_cmd->alias) { |
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| 181 | printf("is an <alias> for command '%s'",shell_cmd->alias->name); |
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| 182 | } else |
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| 183 | if (shell_cmd->usage) { |
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| 184 | pc=shell_cmd->usage; |
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| 185 | while (*pc) { |
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| 186 | switch(*pc) { |
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| 187 | case '\r':break; |
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| 188 | case '\n':putchar('\n'); |
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| 189 | col=0; |
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| 190 | break; |
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| 191 | default :putchar(*pc); |
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| 192 | col++; |
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| 193 | break; |
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| 194 | }; |
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| 195 | pc++; |
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| 196 | if(col>78) { /* What daring... 78?*/ |
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| 197 | if (*pc) { |
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| 198 | putchar('\n'); |
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| 199 | col=0; |
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| 200 | }; |
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| 201 | }; |
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| 202 | if (!col && *pc) { |
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| 203 | printf(" "); |
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| 204 | col=12;line++; |
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| 205 | }; |
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| 206 | }; |
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| 207 | }; |
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| 208 | puts(""); |
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| 209 | return line; |
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| 210 | } |
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| 211 | /* ----------------------------------------------- * |
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| 212 | * show the help. The first command implemented. |
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| 213 | * Can you see the header of routine? Known? |
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| 214 | * The same with all the commands.... |
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| 215 | * ----------------------------------------------- */ |
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| 216 | int shell_help(int argc,char * argv[]) { |
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| 217 | int col,line,arg; |
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| 218 | shell_topic_t *topic; |
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| 219 | shell_cmd_t * shell_cmd=shell_first_cmd; |
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| 220 | if (argc<2) { |
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| 221 | printf("help: TOPIC? The topics are\n"); |
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| 222 | topic=shell_first_topic; |
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| 223 | col=0; |
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| 224 | while (topic) { |
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| 225 | if (!col){ |
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| 226 | col=printf(" %s",topic->topic); |
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| 227 | } else { |
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| 228 | if ((col+strlen(topic->topic)+2)>78){ |
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| 229 | printf("\n"); |
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| 230 | col=printf(" %s",topic->topic); |
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| 231 | } else { |
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| 232 | col+=printf(", %s",topic->topic); |
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| 233 | }; |
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| 234 | }; |
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| 235 | topic=topic->next; |
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| 236 | }; |
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| 237 | printf("\n"); |
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| 238 | return 1; |
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| 239 | }; |
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| 240 | line=0; |
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| 241 | for (arg=1;arg<argc;arg++) { |
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| 242 | if (line>16) { |
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| 243 | printf("Press any key to continue...");getchar(); |
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| 244 | printf("\n"); |
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| 245 | line=0; |
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| 246 | }; |
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| 247 | topic=shell_lookup_topic(argv[arg]); |
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| 248 | if (!topic){ |
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| 249 | if ((shell_cmd=shell_lookup_cmd(argv[arg]))==NULL) { |
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| 250 | printf("help: topic or cmd '%s' not found. Try <help> alone for a list\n",argv[arg]); |
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| 251 | line++; |
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| 252 | } else { |
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| 253 | line+=shell_help_cmd(shell_cmd); |
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| 254 | } |
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| 255 | continue; |
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| 256 | }; |
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| 257 | printf("help: list for the topic '%s'\n",argv[arg]); |
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| 258 | line++; |
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| 259 | while (shell_cmd) { |
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| 260 | if (!strcmp(topic->topic,shell_cmd->topic)) |
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| 261 | line+=shell_help_cmd(shell_cmd); |
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| 262 | if (line>16) { |
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| 263 | printf("Press any key to continue...");getchar(); |
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| 264 | printf("\n"); |
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| 265 | line=0; |
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| 266 | }; |
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| 267 | shell_cmd=shell_cmd->next; |
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| 268 | }; |
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| 269 | }; |
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| 270 | puts(""); |
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| 271 | return 0; |
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| 272 | } |
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| 273 | /* ----------------------------------------------- * |
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| 274 | * TODO:Change to bash readline() better. |
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| 275 | * ----------------------------------------------- */ |
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| 276 | int shell_scanline(char * line,int size,FILE * in,FILE * out) { |
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| 277 | int c,col; |
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| 278 | col=0; |
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| 279 | for (;;) { |
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| 280 | line[col]=0; |
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| 281 | c=fgetc(in); |
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| 282 | switch (c) { |
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| 283 | case EOF :return 0; |
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| 284 | case '\r':if (out) fputc('\n',out); |
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| 285 | return 1; |
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| 286 | case '\b':if (col) { |
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| 287 | if (out) { |
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| 288 | fputc('\b',out); |
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| 289 | fputc(' ',out); |
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| 290 | fputc('\b',out); |
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| 291 | }; |
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| 292 | col--; |
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| 293 | } else { |
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| 294 | if (out) fputc('\a',out); |
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| 295 | }; |
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| 296 | break; |
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| 297 | default :if (!iscntrl(c)) { |
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| 298 | if (col<size-1) { |
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| 299 | line[col++]=c; |
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| 300 | if (out) fputc(c,out); |
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| 301 | } else { |
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| 302 | if (out) fputc('\a',out); |
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| 303 | }; |
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| 304 | } else { |
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| 305 | if (out) fputc('\a',out); |
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| 306 | }; |
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| 307 | break; |
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| 308 | }; |
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| 309 | }; |
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| 310 | } |
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| 311 | /* ----------------------------------------------- * |
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| 312 | * - The shell TASK |
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| 313 | * Poor but enough.. |
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| 314 | * TODO: Redirection. Tty Signals. ENVVARs. Shell language. |
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| 315 | * ----------------------------------------------- */ |
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| 316 | shell_env_t global_shell_env , |
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| 317 | * current_shell_env=&global_shell_env; |
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| 318 | |
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| 319 | extern char **environ; |
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| 320 | |
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| 321 | rtems_task shell_shell(rtems_task_argument task_argument) { |
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| 322 | |
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| 323 | shell_env_t * shell_env =(shell_env_t*) task_argument; |
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| 324 | shell_cmd_t * shell_cmd; |
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| 325 | |
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| 326 | rtems_status_code sc; |
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| 327 | |
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| 328 | struct termios term; |
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| 329 | char * devname; |
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| 330 | char * curdir; |
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| 331 | |
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| 332 | char cmd[256]; |
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| 333 | char last_cmd[256]; /* to repeat 'r' */ |
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| 334 | int argc; |
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| 335 | char * argv[128]; |
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| 336 | |
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| 337 | sc=rtems_libio_set_private_env(); |
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| 338 | if (sc!=RTEMS_SUCCESSFUL) { |
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| 339 | rtems_error(sc,"rtems_libio_set_private_env():"); |
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| 340 | printk("rtems_libio_set_private_env():%d",sc); |
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| 341 | rtems_task_delete(RTEMS_SELF); |
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| 342 | }; |
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| 343 | |
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| 344 | sc=rtems_task_variable_add(RTEMS_SELF,(void*)¤t_shell_env,free); |
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| 345 | if (sc!=RTEMS_SUCCESSFUL) { |
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| 346 | rtems_error(sc,"rtems_task_variable_add():"); |
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| 347 | printk("rtems_task_variable_add():%d",sc); |
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| 348 | rtems_task_delete(RTEMS_SELF); |
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| 349 | }; |
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| 350 | |
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| 351 | current_shell_env=shell_env; /* Set the task var */ |
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| 352 | |
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| 353 | devname=shell_env->devname; |
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| 354 | |
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| 355 | stdin =fopen(devname,"r+"); |
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| 356 | |
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| 357 | if (!stdin) { |
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| 358 | fprintf(stderr,"shell:unable to open stdin.%s:%s\n",devname,strerror(errno)); |
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| 359 | printk("shell:unable to open stdin.(%s)",strerror(errno)); |
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| 360 | rtems_task_delete(RTEMS_SELF); |
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| 361 | }; |
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| 362 | setvbuf(stdin,NULL,_IONBF,0); /* Not buffered*/ |
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| 363 | /* make a raw terminal,Linux MANuals */ |
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| 364 | if (tcgetattr (fileno(stdin), &term)>=0) { |
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| 365 | term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); |
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| 366 | term.c_oflag &= ~OPOST; |
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| 367 | term.c_oflag |= (OPOST|ONLCR); |
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| 368 | term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); |
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| 369 | term.c_cflag = CLOCAL | CREAD |(shell_env->tcflag); |
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| 370 | term.c_cc[VMIN] = 1; |
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| 371 | term.c_cc[VTIME] = 0; |
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| 372 | if (tcsetattr (fileno(stdin), TCSADRAIN, &term) < 0) { |
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| 373 | fprintf(stderr,"shell:cannot set terminal attributes(%s)\n",devname); |
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| 374 | }; |
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| 375 | stdout=fopen(devname,"r+"); |
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| 376 | if (!stdout) { |
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| 377 | fprintf(stderr,"shell:unable to open stdout.%s:%s\n",devname,strerror(errno)); |
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| 378 | }; |
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| 379 | stderr=fopen(devname,"r+"); |
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| 380 | if (!stderr) { |
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| 381 | printf("shell:unable to open stderr.%s:%s\n",devname,strerror(errno)); |
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| 382 | }; |
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| 383 | /* when the future user environment runs ok |
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| 384 | * a freopen() reopens the terminals. Now this don't work |
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| 385 | * (sorry but you can't use because FILENO_STDIN!=0. Better fileno(stdin)) |
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| 386 | */ |
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| 387 | }; |
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| 388 | shell_add_cmd(NULL,NULL,NULL,NULL); /* init the chain list*/ |
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| 389 | strcpy(cmd,""); |
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| 390 | printf("\n" |
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| 391 | "RTEMS-SHELL:%s. "__DATE__". 'help' to list commands.\n",devname); |
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| 392 | curdir=malloc(1024); |
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| 393 | chdir("/"); |
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| 394 | for (;;) { |
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| 395 | /* Prompt section */ |
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| 396 | /* XXX: show_prompt user adjustable */ |
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| 397 | getcwd(curdir,1024); |
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| 398 | printf("%s [%s] # ",devname,curdir); |
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| 399 | /* getcmd section */ |
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| 400 | if (!shell_scanline(cmd,sizeof(cmd),stdin,stdout)) { |
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| 401 | printf("shell:unable scanline(%s)\n",devname); |
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| 402 | break; |
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| 403 | }; |
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| 404 | /* evaluate cmd section */ |
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| 405 | if (!strcmp(cmd,"r")) { /* repeat last command, forced, not automatic */ |
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| 406 | strcpy(cmd,last_cmd); |
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| 407 | } else |
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| 408 | if (strcmp(cmd,"")) { /* only for get a new prompt */ |
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| 409 | strcpy(last_cmd,cmd); |
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| 410 | }; |
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| 411 | /* exec cmd section */ |
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| 412 | /* TODO: |
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| 413 | * To avoid user crash catch the signals. |
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| 414 | * Open a new stdio files with posibility of redirection * |
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| 415 | * Run in a new shell task background. (unix &) |
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| 416 | * Resuming. A little bash. |
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| 417 | */ |
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| 418 | if (shell_make_args(cmd,&argc,argv)) { |
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| 419 | if ((shell_cmd=shell_lookup_cmd(argv[0]))!=NULL) { |
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| 420 | current_shell_env->errorlevel=shell_cmd->command(argc,argv); |
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| 421 | } else { |
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| 422 | printf("shell:%s command not found\n",argv[0]); |
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| 423 | current_shell_env->errorlevel=-1; |
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| 424 | }; |
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| 425 | }; |
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| 426 | /* end exec cmd section */ |
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| 427 | }; |
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| 428 | free(curdir); |
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| 429 | rtems_task_delete(RTEMS_SELF); |
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| 430 | } |
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| 431 | /* ----------------------------------------------- */ |
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| 432 | rtems_status_code shell_init (char * task_name, |
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| 433 | rtems_unsigned32 task_stacksize, |
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| 434 | rtems_task_priority task_priority, |
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| 435 | char * devname, |
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| 436 | tcflag_t tcflag) { |
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| 437 | rtems_id task_id; |
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| 438 | rtems_status_code sc; |
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| 439 | shell_env_t * shell_env; |
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| 440 | sc=rtems_task_create(new_rtems_name(task_name), |
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| 441 | task_priority, |
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| 442 | task_stacksize?task_stacksize:RTEMS_MINIMUM_STACK_SIZE, |
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| 443 | (RTEMS_DEFAULT_MODES&~RTEMS_ASR_MASK)|RTEMS_ASR, |
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| 444 | RTEMS_DEFAULT_ATTRIBUTES, |
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| 445 | &task_id); |
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| 446 | if (sc!=RTEMS_SUCCESSFUL) { |
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| 447 | rtems_error(sc,"creating task %s in shell_init()",task_name); |
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| 448 | return sc; |
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| 449 | }; |
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| 450 | shell_env=malloc(sizeof(shell_env_t)); |
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| 451 | if (!shell_env) { |
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| 452 | rtems_task_delete(task_id); |
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| 453 | sc=RTEMS_NO_MEMORY; |
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| 454 | rtems_error(sc,"allocating shell_env %s in shell_init()",task_name); |
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| 455 | return sc; |
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| 456 | }; |
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| 457 | if (global_shell_env.magic!=new_rtems_name("SENV")) { |
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| 458 | global_shell_env.magic =new_rtems_name("SENV"); |
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| 459 | global_shell_env.devname ="/dev/console"; |
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| 460 | global_shell_env.taskname="GLOBAL"; |
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| 461 | global_shell_env.tcflag =0; |
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| 462 | }; |
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| 463 | shell_env->magic =global_shell_env.magic; |
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| 464 | shell_env->devname =devname; |
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| 465 | shell_env->taskname=task_name; |
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| 466 | shell_env->tcflag =tcflag; |
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| 467 | return rtems_task_start(task_id,shell_shell,(rtems_task_argument) shell_env); |
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| 468 | } |
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| 469 | /* ----------------------------------------------- */ |
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| 470 | |
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