Annotation of prex/usr/bin/sh/sh.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 2005-2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <prex/prex.h>
! 31: #include <prex/keycode.h>
! 32: #include <sys/syslog.h>
! 33:
! 34: #include <limits.h>
! 35: #include <termios.h>
! 36: #include <ctype.h>
! 37: #include <unistd.h>
! 38: #include <string.h>
! 39: #include <stdio.h>
! 40: #include <errno.h>
! 41:
! 42: #include "sh.h"
! 43:
! 44: #define LINELEN 256
! 45: #define ARGMAX 32
! 46:
! 47: #ifdef CMDBOX
! 48: extern const struct cmd_entry builtin_cmds[];
! 49: extern int exec_builtin(cmd_func_t, int argc, char *argv[]);
! 50: #define main(argc, argv) sh_main(argc, argv)
! 51: #endif
! 52:
! 53: extern int exec_cmd(int argc, char *argv[]);
! 54: extern const struct cmd_entry internal_cmds[];
! 55:
! 56: static char *args[ARGMAX];
! 57:
! 58: /*
! 59: * Find command from the specifid table.
! 60: *
! 61: * Returns 0 if command is processed.
! 62: * Returns -1 if no command is found.
! 63: */
! 64: static cmd_func_t
! 65: find_cmd(const struct cmd_entry cmds[], char *cmd)
! 66: {
! 67: int i = 0;
! 68:
! 69: while (cmds[i].cmd != NULL) {
! 70: if (!strcmp(cmd, cmds[i].cmd))
! 71: return cmds[i].func;
! 72: i++;
! 73: }
! 74: return NULL;
! 75: }
! 76:
! 77: /*
! 78: * Parse an entire given line.
! 79: * Break it down into commands.
! 80: */
! 81: static void
! 82: parse_line(char *line)
! 83: {
! 84: char *p = line;
! 85: int i, argc;
! 86: cmd_func_t cmd;
! 87:
! 88: /*
! 89: * Build argument list
! 90: */
! 91: i = 0;
! 92: do {
! 93: /* Ignore whitespace at beginning */
! 94: while (*p && isspace((int)*p))
! 95: p++;
! 96: if (*p == '\0')
! 97: break;
! 98: args[i] = p;
! 99: i++;
! 100:
! 101: /* Skip word */
! 102: while (*p && !isspace((int)*p))
! 103: p++;
! 104: if (*p == '\0')
! 105: break;
! 106: *p++ = '\0';
! 107: } while (i < ARGMAX - 1);
! 108:
! 109: if (i == ARGMAX) {
! 110: fprintf(stderr, "Too many args\n");
! 111: return;
! 112: }
! 113: args[i] = NULL;
! 114: argc = i;
! 115:
! 116: /*
! 117: * Dispatch command
! 118: */
! 119: if (argc > 0) {
! 120: optind = 1;
! 121:
! 122: /* Run it as internal command */
! 123: cmd = find_cmd(internal_cmds, args[0]);
! 124: if (cmd != NULL) {
! 125: if ((*cmd)(argc, args) != 0) {
! 126: fprintf(stderr, "%s: %s\n", args[0],
! 127: strerror(errno));
! 128: }
! 129: return;
! 130: }
! 131: #ifdef CMDBOX
! 132: /* Run it as shell built-in command */
! 133: cmd = find_cmd(builtin_cmds, args[0]);
! 134: if (cmd != NULL) {
! 135: exec_builtin(cmd, argc, args);
! 136: return;
! 137: }
! 138: #endif
! 139: /* Next, run it as external command */
! 140: exec_cmd(argc, args);
! 141: }
! 142: }
! 143:
! 144: /*
! 145: * Read command string.
! 146: */
! 147: static char *
! 148: read_line(char *line, int len, int fd)
! 149: {
! 150: char *p, *end;
! 151: int c;
! 152:
! 153: end = line + len;
! 154: for (p = line; p < end; p++) {
! 155: c = getchar();
! 156: if (c == EOF) {
! 157: if (p == line)
! 158: return NULL;
! 159: *p = '\0';
! 160: return p;
! 161: }
! 162: if (c == '\n') {
! 163: *p = '\0';
! 164: return p;
! 165: }
! 166: *p = (char)c;
! 167: }
! 168: fprintf(stderr, "Command line overflow\n");
! 169: return (char *)-1;
! 170: }
! 171:
! 172: int
! 173: main(int argc, char **argv)
! 174: {
! 175: static char line[LINELEN];
! 176: static char cwd[PATH_MAX];
! 177: char *p;
! 178:
! 179: signal(SIGINT, SIG_IGN);
! 180: signal(SIGQUIT, SIG_IGN);
! 181: signal(SIGTERM, SIG_IGN);
! 182: signal(SIGTSTP, SIG_IGN); /* temporary... */
! 183:
! 184: /*
! 185: * Command loop
! 186: */
! 187: for (;;) {
! 188: next:
! 189: /* Display prompt */
! 190: getcwd(cwd, PATH_MAX);
! 191: printf("\033[32m");
! 192: printf("[prex:%s]", cwd);
! 193: printf("\033[0m# ");
! 194:
! 195: /* Read and parse user input */
! 196: p = read_line(line, LINELEN, 0);
! 197: if (p == NULL)
! 198: break;
! 199: if (p == (char *)-1)
! 200: continue;
! 201: while (*(p - 1) == '\\' && (p - 2) >= line
! 202: && *(p - 2) != '\\') {
! 203: *(p - 1) = ' ';
! 204: p = read_line(p, LINELEN - (p - line), 0);
! 205: if (p == NULL)
! 206: break;
! 207: if (p == (char *)-1)
! 208: goto next;
! 209: }
! 210: parse_line(line);
! 211: }
! 212: printf("bye!\n");
! 213: exit(0);
! 214: return 0;
! 215: }
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