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("--no-implied:  ignore implications.\n");
  67         printf("--assume-loops:  assume loops always go through at least once.\n");
  68         printf("--known-conditions:  don't branch for known conditions.\n");
  69         printf("--no-data:  do not use the /smatch_data/ directory.\n");
  70         printf("--help:  print this helpfull message.\n");
  71         exit(1);
  72 }
  73
  74 void parse_args(int *argcp, char ***argvp)
  75 {
  76         while(*argcp >= 2) {
  77                 if (!strcmp((*argvp)[1], "--debug")) {
  78                         debug_states = 1;
  79                         (*argvp)[1] = (*argvp)[0];
  80                 } else if (!strcmp((*argvp)[1], "--debug-implied")) {
  81                         debug_implied_states = 1;
  82                         (*argvp)[1] = (*argvp)[0];
  83                 } else if (!strcmp((*argvp)[1], "--no-implied")) {
  84                         option_no_implied = 1;
  85                         (*argvp)[1] = (*argvp)[0];
  86                 } else if (!strcmp((*argvp)[1], "--assume-loops")) {
  87                         option_assume_loops = 1;
  88                         (*argvp)[1] = (*argvp)[0];
  89                 } else if (!strcmp((*argvp)[1], "--known-conditions")) {
  90                         option_known_conditions = 1;
  91                         (*argvp)[1] = (*argvp)[0];
  92                 } else if (!strcmp((*argvp)[1], "--no-data")) {
  93                         option_no_data = 1;
  94                         (*argvp)[1] = (*argvp)[0];
  95                 } else if (!strcmp((*argvp)[1], "--help")) {
  96                         help();
  97                 } else {
  98                         break;
  99                 }
 100                 (*argcp)--;
 101                 (*argvp)++;
 102         }
 103 }
 104
 105 static char *get_data_dir(char *arg0)
 106 {
 107         char *bin_dir;
 108         char buf[256];
 109         char *dir;
 110
 111         if (option_no_data) {
 112                 return NULL;
 113         }
 114         bin_dir = dirname(alloc_string(arg0));
 115         strncpy(buf, bin_dir, 254);
 116         buf[255] = '\0';
 117         strncat(buf, "/smatch_data/", 254 - strlen(buf));
 118         dir = alloc_string(buf);
 119         if (!access(dir, R_OK))
 120                 return dir;
 121         printf("Warning: %s is not accessible.\n", dir);
 122         printf("Use --no-data to suppress this message.\n");
 123         return NULL;
 124 }
 125
 126 int main(int argc, char **argv)
 127 {
 128         int i;
 129         reg_func func;
 130
 131         parse_args(&argc, &argv);
 132
 133         data_dir = get_data_dir(argv[0]);
 134
 135         /* The script IDs start at 1.
 136            0 is used for internal stuff. */
 137         create_function_hash();
 138         for(i = 0; (func = reg_funcs[i]); i++){
 139                 func(i + 1);
 140         }
 141         register_function_hooks(-1);
 142
 143         smatch(argc, argv);
 144         free_string(data_dir);
 145         return 0;
 146 }