smatch.c

   1 /*
   2  * sparse/smatch.c
   3  *
   4  * Copyright (C) 2006 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <libgen.h>
  13 #include "smatch.h"
  14
  15 char *data_dir;
  16 int option_no_data = 0;
  17
  18 typedef void (*reg_func) (int id);
  19 void register_smatch_extra(int id);
  20 void register_smatch_ignore(int id);
  21 void register_implications(int id);
  22 void register_function_hooks(int id);
  23 void check_debug(int id);
  24 void check_null_deref(int id);
  25 void check_overflow(int id);
  26 void check_locking(int id);
  27 void check_memory(int id);
  28 void check_frees_argument(int id);
  29 void check_puts_argument(int id);
  30 void check_leaks(int id);
  31 void check_type(int id);
  32 void check_allocation_funcs(int id);
  33 void check_err_ptr(int id);
  34 void check_err_ptr_deref(int id);
  35 /* <- your test goes here */
  36 /* void register_template(int id); */
  37
  38 static const reg_func reg_funcs[] = {
  39         &register_smatch_extra, /* smatch_extra always has to be first */
  40         &register_smatch_ignore,
  41         &check_debug,
  42         &check_null_deref,
  43         &check_overflow,
  44         &check_locking,
  45         &check_memory,
  46         // &check_type,
  47         // &check_allocation_funcs,
  48         // &check_leaks,
  49         // &check_frees_argument,
  50         // &check_puts_argument,
  51         // &check_err_ptr,
  52         &check_err_ptr_deref,
  53
  54         /* <- your test goes here */
  55         /* &register_template, */
  56
  57         &register_implications, /* implications always has to be last */
  58         NULL
  59 };
  60
  61 static void help(void)
  62 {
  63         printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
  64         printf("--debug:  print lots of debug output.\n");
  65         printf("--debug-implied:  print debug output about implications.\n");
  66         printf("--oom <num>:  number of mB memory to use before giving up.\n");
  67         printf("--no-implied:  ignore implications.\n");
  68         printf("--assume-loops:  assume loops always go through at least once.\n");
  69         printf("--known-conditions:  don't branch for known conditions.\n");
  70         printf("--no-data:  do not use the /smatch_data/ directory.\n");
  71         printf("--help:  print this helpfull message.\n");
  72         exit(1);
  73 }
  74
  75 void parse_args(int *argcp, char ***argvp)
  76 {
  77         while(*argcp >= 2) {
  78                 if (!strcmp((*argvp)[1], "--debug")) {
  79                         debug_states = 1;
  80                         (*argvp)[1] = (*argvp)[0];
  81                 } else if (!strcmp((*argvp)[1], "--debug-implied")) {
  82                         debug_implied_states = 1;
  83                         (*argvp)[1] = (*argvp)[0];
  84                 } else if (!strcmp((*argvp)[1], "--oom")) {
  85                         option_oom_kb = atoi((*argvp)[2]) * 1000;
  86                         (*argvp)[2] = (*argvp)[0];
  87                         (*argcp)--;
  88                         (*argvp)++;
  89                 } else if (!strcmp((*argvp)[1], "--no-implied")) {
  90                         option_no_implied = 1;
  91                         (*argvp)[1] = (*argvp)[0];
  92                 } else if (!strcmp((*argvp)[1], "--assume-loops")) {
  93                         option_assume_loops = 1;
  94                         (*argvp)[1] = (*argvp)[0];
  95                 } else if (!strcmp((*argvp)[1], "--known-conditions")) {
  96                         option_known_conditions = 1;
  97                         (*argvp)[1] = (*argvp)[0];
  98                 } else if (!strcmp((*argvp)[1], "--no-data")) {
  99                         option_no_data = 1;
 100                         (*argvp)[1] = (*argvp)[0];
 101                 } else if (!strcmp((*argvp)[1], "--help")) {
 102                         help();
 103                 } else {
 104                         break;
 105                 }
 106                 (*argcp)--;
 107                 (*argvp)++;
 108         }
 109 }
 110
 111 static char *get_data_dir(char *arg0)
 112 {
 113         char *bin_dir;
 114         char buf[256];
 115         char *dir;
 116
 117         if (option_no_data) {
 118                 return NULL;
 119         }
 120         bin_dir = dirname(alloc_string(arg0));
 121         strncpy(buf, bin_dir, 254);
 122         buf[255] = '\0';
 123         strncat(buf, "/smatch_data/", 254 - strlen(buf));
 124         dir = alloc_string(buf);
 125         if (!access(dir, R_OK))
 126                 return dir;
 127         printf("Warning: %s is not accessible.\n", dir);
 128         printf("Use --no-data to suppress this message.\n");
 129         return NULL;
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134         int i;
 135         reg_func func;
 136
 137         parse_args(&argc, &argv);
 138
 139         data_dir = get_data_dir(argv[0]);
 140
 141         /* The script IDs start at 1.
 142            0 is used for internal stuff. */
 143         create_function_hash();
 144         for(i = 0; (func = reg_funcs[i]); i++){
 145                 func(i + 1);
 146         }
 147         register_function_hooks(-1);
 148
 149         smatch(argc, argv);
 150         free_string(data_dir);
 151         return 0;
 152 }