disassembler/args.c

   1 /*
   2  *   Copyright (C) 2006-2007  Michael Buesch <mb@bu3sch.de>
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #include "args.h"
  15 #include "main.h"
  16 #include "util.h"
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <fcntl.h>
  22 #include <unistd.h>
  23
  24
  25 struct cmdline_args cmdargs = {
  26         .debug                  = 0,
  27         .arch                   = 5,
  28         .informat               = FMT_B43,
  29         .print_addresses        = 0,
  30         .unknown_decode         = 0,
  31 };
  32
  33 #define ARG_MATCH               0
  34 #define ARG_NOMATCH             1
  35 #define ARG_ERROR               -1
  36
  37 static int do_cmp_arg(char **argv, int *pos,
  38                       const char *template,
  39                       int allow_merged,
  40                       char **param)
  41 {
  42         char *arg;
  43         char *next_arg;
  44         size_t arg_len, template_len;
  45
  46         arg = argv[*pos];
  47         next_arg = argv[*pos + 1];
  48         arg_len = strlen(arg);
  49         template_len = strlen(template);
  50
  51         if (param) {
  52                 /* Maybe we have a merged parameter here.
  53                  * A merged parameter is "-pfoobar" for example.
  54                  */
  55                 if (allow_merged && arg_len > template_len) {
  56                         if (memcmp(arg, template, template_len) == 0) {
  57                                 *param = arg + template_len;
  58                                 return ARG_MATCH;
  59                         }
  60                         return ARG_NOMATCH;
  61                 } else if (arg_len != template_len)
  62                         return ARG_NOMATCH;
  63                 *param = next_arg;
  64         }
  65         if (strcmp(arg, template) == 0) {
  66                 if (param) {
  67                         /* Skip the parameter on the next iteration. */
  68                         (*pos)++;
  69                         if (*param == NULL) {
  70                                 fprintf(stderr, "%s needs a parameter\n", arg);
  71                                 return ARG_ERROR;
  72                         }
  73                 }
  74                 return ARG_MATCH;
  75         }
  76
  77         return ARG_NOMATCH;
  78 }
  79
  80 /* Simple and lean command line argument parsing. */
  81 static int cmp_arg(char **argv, int *pos,
  82                    const char *long_template,
  83                    const char *short_template,
  84                    char **param)
  85 {
  86         int err;
  87
  88         if (long_template) {
  89                 err = do_cmp_arg(argv, pos, long_template, 0, param);
  90                 if (err == ARG_MATCH || err == ARG_ERROR)
  91                         return err;
  92         }
  93         err = ARG_NOMATCH;
  94         if (short_template)
  95                 err = do_cmp_arg(argv, pos, short_template, 1, param);
  96         return err;
  97 }
  98
  99 static void usage(FILE *fd, int argc, char **argv)
 100 {
 101         fprintf(fd, "Usage: %s INPUT_FILE OUTPUT_FILE [OPTIONS]\n", argv[0]);
 102         fprintf(fd, "  -a|--arch ARCH      The architecture type of the input file (5 or 15)\n");
 103         fprintf(fd, "  -f|--format FMT     Input file format. FMT must be one of:\n");
 104         fprintf(fd, "                      raw-le32, raw-be32, b43\n");
 105         fprintf(fd, "  -p|--paddr          Print the code addresses\n");
 106         fprintf(fd, "  -u|--unkdec         Decode operands of unknown instructions\n");
 107         fprintf(fd, "  -d|--debug          Print verbose debugging info\n");
 108         fprintf(fd, "                      Repeat for more verbose debugging\n");
 109         fprintf(fd, "  -h|--help           Print this help\n");
 110 }
 111
 112 int parse_args(int argc, char **argv)
 113 {
 114         int i;
 115         int res;
 116         char *param;
 117
 118         infile_name = NULL;
 119         outfile_name = NULL;
 120
 121         for (i = 1; i < argc; i++) {
 122                 if ((res = cmp_arg(argv, &i, "--help", "-h", NULL)) == ARG_MATCH) {
 123                         usage(stdout, argc, argv);
 124                         return 1;
 125                 } else if ((res = cmp_arg(argv, &i, "--format", "-f", &param)) == ARG_MATCH) {
 126                         if (strcasecmp(param, "raw-le32") == 0)
 127                                 cmdargs.informat = FMT_RAW_LE32;
 128                         else if (strcasecmp(param, "raw-be32") == 0)
 129                                 cmdargs.informat = FMT_RAW_BE32;
 130                         else if (strcasecmp(param, "b43") == 0)
 131                                 cmdargs.informat = FMT_B43;
 132                         else {
 133                                 fprintf(stderr, "Invalid -f|--format\n");
 134                                 return -1;
 135                         }
 136                 } else if ((res = cmp_arg(argv, &i, "--paddr", "-p", NULL)) == ARG_MATCH) {
 137                         cmdargs.print_addresses = 1;
 138                 } else if ((res = cmp_arg(argv, &i, "--unkdec", "-u", NULL)) == ARG_MATCH) {
 139                         cmdargs.unknown_decode = 1;
 140                 } else if ((res = cmp_arg(argv, &i, "--debug", "-d", NULL)) == ARG_MATCH) {
 141                         cmdargs.debug++;
 142                 } else if ((res = cmp_arg(argv, &i, "--arch", "-a", &param)) == ARG_MATCH) {
 143                         unsigned long arch;
 144                         char *tail;
 145
 146                         arch = strtol(param, &tail, 0);
 147                         if (strlen(tail) || (arch != 5 && arch != 15)) {
 148                                 fprintf(stderr, "Unsupported architecture \"%s\"\n",
 149                                         param);
 150                                 return -1;
 151                         }
 152                         cmdargs.arch = arch;
 153                 } else {
 154                         if (!infile_name) {
 155                                 infile_name = argv[i];
 156                                 continue;
 157                         }
 158                         if (!outfile_name) {
 159                                 outfile_name = argv[i];
 160                                 continue;
 161                         }
 162                         fprintf(stderr, "Unrecognized argument: %s\n", argv[i]);
 163                         goto out_usage;
 164                 }
 165         }
 166         if (!infile_name || !outfile_name)
 167                 goto out_usage;
 168
 169         return 0;
 170 out_usage:
 171         usage(stderr, argc, argv);
 172         return -1;
 173 }
 174
 175 int open_input_file(void)
 176 {
 177         if (strcmp(infile_name, "-") == 0) {
 178                 infile = stdin;
 179         } else {
 180                 infile = fopen(infile_name, "r");
 181                 if (!infile) {
 182                         fprintf(stderr, "Could not open INPUT_FILE %s\n",
 183                                 infile_name);
 184                         return -1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 void close_input_file(void)
 192 {
 193         if (strcmp(infile_name, "-") != 0)
 194                 fclose(infile);
 195 }
 196
 197 int open_output_file(void)
 198 {
 199         if (strcmp(outfile_name, "-") == 0) {
 200                 outfile = stdout;
 201         } else {
 202                 outfile = fopen(outfile_name, "w+");
 203                 if (!outfile) {
 204                         fprintf(stderr, "Could not open OUTPUT_FILE %s\n",
 205                                 outfile_name);
 206                         return -1;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 void close_output_file(void)
 214 {
 215         if (strcmp(outfile_name, "-") != 0)
 216                 fclose(outfile);
 217 }