Annotation of prex-old/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 512
! 45:
! 46: #ifdef CMDBOX
! 47: extern const struct cmd_entry builtin_cmds[];
! 48: extern int exec_builtin(cmd_func_t, int argc, char *argv[]);
! 49: #define main(argc, argv) sh_main(argc, argv)
! 50: #endif
! 51:
! 52: extern int exec_cmd(int argc, char *argv[]);
! 53: extern const struct cmd_entry internal_cmds[];
! 54:
! 55: static char *argv[20];
! 56:
! 57: /*
! 58: * Read command string.
! 59: */
! 60: static char *
! 61: read_line(char *line, int len)
! 62: {
! 63: int c, index = 0;
! 64:
! 65: for (;;) {
! 66: c = getchar();
! 67: switch (c) {
! 68: case '\n':
! 69: case EOF:
! 70: line[index] = 0;
! 71: return &line[index];
! 72:
! 73: default:
! 74: if (index > len) {
! 75: fprintf(stderr, "Command line overflow\n");
! 76: return (char *)-1;
! 77: }
! 78: if (c < 0x80) {
! 79: line[index] = (char)c;
! 80: index++;
! 81: }
! 82: break;
! 83: }
! 84: }
! 85: }
! 86:
! 87: /*
! 88: * Find command from the specifid table.
! 89: *
! 90: * Returns 0 if command is processed.
! 91: * Returns -1 if no command is found.
! 92: */
! 93: static cmd_func_t
! 94: find_cmd(const struct cmd_entry cmds[], char *cmd)
! 95: {
! 96: int i = 0;
! 97:
! 98: while (cmds[i].cmd != NULL) {
! 99: if (!strcmp(cmd, cmds[i].cmd))
! 100: return cmds[i].func;
! 101: i++;
! 102: }
! 103: return NULL;
! 104: }
! 105:
! 106: /*
! 107: * Parse an entire given line.
! 108: * Break it down into commands.
! 109: */
! 110: static void
! 111: parse_line(char *line)
! 112: {
! 113: char *p = line;
! 114: int argc = 0;
! 115: cmd_func_t cmd;
! 116:
! 117: /*
! 118: * Build argument list
! 119: */
! 120: for (;;) {
! 121: /* Skip space */
! 122: while (*p && isspace((int)*p))
! 123: p++;
! 124: if (*p == 0)
! 125: break;
! 126: argv[argc++] = p;
! 127:
! 128: /* Skip word */
! 129: while (*p && !isspace((int)*p))
! 130: p++;
! 131: if (*p == 0)
! 132: break;
! 133: *p++ = 0;
! 134: }
! 135: argv[argc] = NULL;
! 136:
! 137: /*
! 138: * Dispatch command
! 139: */
! 140: if (argc) {
! 141: optind = 1;
! 142:
! 143: /* Run it as internal command */
! 144: cmd = find_cmd(internal_cmds, argv[0]);
! 145: if (cmd != NULL) {
! 146: if ((cmd)(argc, argv) != 0) {
! 147: fprintf(stderr, "%s: %s\n", argv[0],
! 148: strerror(errno));
! 149: }
! 150: return;
! 151: }
! 152: #ifdef CMDBOX
! 153: /* Run it as shell built-in command */
! 154: cmd = find_cmd(builtin_cmds, argv[0]);
! 155: if (cmd != NULL) {
! 156: exec_builtin(cmd, argc, argv);
! 157: return;
! 158: }
! 159: #endif
! 160: /* Next, run it as external command */
! 161: exec_cmd(argc, argv);
! 162: }
! 163: }
! 164:
! 165: int
! 166: main(int dummy, char *argv[])
! 167: {
! 168: static char line[LINELEN];
! 169: static char cwd[PATH_MAX];
! 170: char *p;
! 171:
! 172: signal(SIGINT, SIG_IGN);
! 173: signal(SIGQUIT, SIG_IGN);
! 174: signal(SIGTERM, SIG_IGN);
! 175:
! 176: /*
! 177: * Command loop
! 178: */
! 179: for (;;) {
! 180: next:
! 181: /* Display prompt */
! 182: getcwd(cwd, PATH_MAX);
! 183: printf("\033[32m");
! 184: printf("[prex:%s]", cwd);
! 185: printf("\033[0m# ");
! 186:
! 187: /* Read and parse user input */
! 188: p = read_line(line, LINELEN);
! 189: if (p == NULL)
! 190: break;
! 191: if (p == (char *)-1)
! 192: continue;
! 193: while (*(p - 1) == '\\' && (p - 2) >= line
! 194: && *(p - 2) != '\\') {
! 195: *(p - 1) = ' ';
! 196: p = read_line(p, LINELEN - (p - line));
! 197: if (p == NULL)
! 198: break;
! 199: if (p == (char *)-1)
! 200: goto next;
! 201: }
! 202: parse_line(line);
! 203: }
! 204: return 0;
! 205: }
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