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 int _debug;
  26
  27 struct cmdline_args cmdargs = {
  28         .arch = 5,              /* Default to v5 architecture. */
  29         .informat = FMT_B43,    /* Input file format */
  30         .print_addresses = 0,   /* Print the code addresses in the output. */
  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 may be one of:\n");
 104         fprintf(fd, "                      raw-le32, raw-be32, b43\n");
 105         fprintf(fd, "  --paddr             Print the code addresses\n");
 106         fprintf(fd, "  -d|--debug          Print verbose debugging info\n");
 107         fprintf(fd, "                      Repeat for more verbose debugging\n");
 108         fprintf(fd, "  -h|--help           Print this help\n");
 109 }
 110
 111 int parse_args(int argc, char **argv)
 112 {
 113         int i;
 114         int res;
 115         char *param;
 116
 117         infile_name = NULL;
 118         outfile_name = NULL;
 119
 120         for (i = 1; i < argc; i++) {
 121                 if ((res = cmp_arg(argv, &i, "--help", "-h", NULL)) == ARG_MATCH) {
 122                         usage(stdout, argc, argv);
 123                         return 1;
 124                 } else if ((res = cmp_arg(argv, &i, "--format", "-f", &param)) == ARG_MATCH) {
 125                         if (strcasecmp(param, "raw-le32") == 0)
 126                                 cmdargs.informat = FMT_RAW_LE32;
 127                         else if (strcasecmp(param, "raw-be32") == 0)
 128                                 cmdargs.informat = FMT_RAW_BE32;
 129                         else if (strcasecmp(param, "b43") == 0)
 130                                 cmdargs.informat = FMT_B43;
 131                         else {
 132                                 fprintf(stderr, "Invalid -f|--format\n");
 133                                 return -1;
 134                         }
 135                 } else if ((res = cmp_arg(argv, &i, "--paddr", NULL, NULL)) == ARG_MATCH) {
 136                         cmdargs.print_addresses = 1;
 137                 } else if ((res = cmp_arg(argv, &i, "--debug", "-d", NULL)) == ARG_MATCH) {
 138                         _debug++;
 139                 } else if ((res = cmp_arg(argv, &i, "--arch", "-a", &param)) == ARG_MATCH) {
 140                         unsigned long arch;
 141                         char *tail;
 142
 143                         arch = strtol(param, &tail, 0);
 144                         if (strlen(tail) || (arch != 5 && arch != 15)) {
 145                                 fprintf(stderr, "Unsupported architecture \"%s\"\n",
 146                                         param);
 147                                 return -1;
 148                         }
 149                         cmdargs.arch = arch;
 150                 } else {
 151                         if (!infile_name) {
 152                                 infile_name = argv[i];
 153                                 continue;
 154                         }
 155                         if (!outfile_name) {
 156                                 outfile_name = argv[i];
 157                                 continue;
 158                         }
 159                         fprintf(stderr, "Unrecognized argument: %s\n", argv[i]);
 160                         goto out_usage;
 161                 }
 162         }
 163         if (!infile_name || !outfile_name)
 164                 goto out_usage;
 165
 166         return 0;
 167 out_usage:
 168         usage(stderr, argc, argv);
 169         return -1;
 170 }
 171
 172 int open_input_file(void)
 173 {
 174         if (strcmp(infile_name, "-") == 0) {
 175                 infile = stdin;
 176         } else {
 177                 infile = fopen(infile_name, "r");
 178                 if (!infile) {
 179                         fprintf(stderr, "Could not open INPUT_FILE %s\n",
 180                                 infile_name);
 181                         return -1;
 182                 }
 183         }
 184
 185         return 0;
 186 }
 187
 188 void close_input_file(void)
 189 {
 190         if (strcmp(infile_name, "-") != 0)
 191                 fclose(infile);
 192 }
 193
 194 int open_output_file(void)
 195 {
 196         if (strcmp(outfile_name, "-") == 0) {
 197                 outfile = stdout;
 198         } else {
 199                 outfile = fopen(outfile_name, "w+");
 200                 if (!outfile) {
 201                         fprintf(stderr, "Could not open OUTPUT_FILE %s\n",
 202                                 outfile_name);
 203                         return -1;
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 void close_output_file(void)
 211 {
 212         if (strcmp(outfile_name, "-") != 0)
 213                 fclose(outfile);
 214 }