*new* check_container_of: container_of() doesn't return NULL

[smatch.git] / smatch.c

/*
 * sparse/smatch.c
 *
 * Copyright (C) 2006 Dan Carpenter.
 *
 * Licensed under the Open Software License version 1.1
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <libgen.h>
#include "smatch.h"
#include "check_list.h"

char *option_project_str = (char *)"";
enum project_type option_project = PROJ_NONE;
char *data_dir;
int option_no_data = 0;
int option_spammy = 0;
int option_info = 0;
int option_full_path = 0;
int option_param_mapper = 0;
int option_print_returns = 0;
int option_call_tree = 0;
int option_no_db = 0;

typedef void (*reg_func) (int id);
#define CK(_x) {.name = #_x, .func = &_x},
static struct reg_func_info {
        const char *name;
        reg_func func;
} reg_funcs[] = {
#include "check_list.h"
};
#undef CK
int num_checks = ARRAY_SIZE(reg_funcs);

const char *check_name(unsigned short id)
{
        if (id > ARRAY_SIZE(reg_funcs)) {
                return "internal";
        }
        return reg_funcs[id - 1].name;
}

int id_from_name(const char *name)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(reg_funcs); i++) {
                if (!strcmp(name, reg_funcs[i].name))
                        return i + 1;
        }
        return 0;
}

static void help(void)
{
        printf("Usage:  smatch [smatch arguments][sparse arguments] file.c\n");
        printf("--project=<name> or -p=<name>: project specific tests\n");
        printf("--spammy:  print superfluous crap.\n");
        printf("--info:  print info used to fill smatch_data/.\n");
        printf("--debug:  print lots of debug output.\n");
        printf("--param-mapper:  enable param_mapper output.\n");
        printf("--no-data:  do not use the /smatch_data/ directory.\n");
        printf("--full-path:  print the full pathname.\n");
        printf("--debug-implied:  print debug output about implications.\n");
        printf("--no-implied:  ignore implications.\n");
        printf("--assume-loops:  assume loops always go through at least once.\n");
        printf("--known-conditions:  don't branch for known conditions.\n");
        printf("--two-passes:  use a two pass system for each function.\n");
        printf("--help:  print this helpfull message.\n");
        exit(1);
}

static int match_option(const char *arg, const char *option)
{
        char *str;
        char *tmp;
        int ret = 0;

        str = malloc(strlen(option) + 3); 
        snprintf(str, strlen(option) + 3, "--%s", option);
        tmp = str;
        while (*tmp) {
                if (*tmp == '_')
                        *tmp = '-';
                tmp++;
        }
        if (!strcmp(arg, str))
                ret = 1;
        free(str);
        return ret;
} 

#define OPTION(_x) do {                                 \
        if (!found && match_option((*argvp)[1], #_x)) { \
                found = 1;                              \
                option_##_x = 1;                                        \
                (*argvp)[1] = (*argvp)[0];              \
        }                                               \
} while (0)

void parse_args(int *argcp, char ***argvp)
{
        while(*argcp >= 2) {
                int found = 0;
                if (!strcmp((*argvp)[1], "--help")) {
                        help();
                }
                if (!found && !strncmp((*argvp)[1], "--project=", 10)) {
                        option_project_str = (*argvp)[1] + 10;
                        (*argvp)[1] = (*argvp)[0];
                        found = 1;
                }
                if (!found && !strncmp((*argvp)[1], "-p=", 3)) {
                        option_project_str = (*argvp)[1] + 3;
                        (*argvp)[1] = (*argvp)[0];
                        found = 1;
                }
                OPTION(spammy);
                OPTION(info);
                OPTION(debug);
                OPTION(debug_implied);
                OPTION(no_implied);
                OPTION(assume_loops);
                OPTION(known_conditions);
                OPTION(no_data);
                OPTION(two_passes);
                OPTION(full_path);
                OPTION(param_mapper);
                OPTION(print_returns);
                OPTION(call_tree);
                if (!found)
                        break;
                (*argcp)--;
                (*argvp)++;
        }

        if (!strcmp(option_project_str, "kernel"))
                option_project = PROJ_KERNEL;
        if (!strcmp(option_project_str, "wine"))
                option_project = PROJ_WINE;
}

static char *get_data_dir(char *arg0)
{
        char *bin_dir;
        char *orig;
        char buf[256];
        char *dir;

        if (option_no_data) {
                return NULL;
        }

        orig = alloc_string(arg0);
        bin_dir = dirname(orig);
        strncpy(buf, bin_dir, 254);
        free_string(orig);

        buf[255] = '\0';
        strncat(buf, "/smatch_data/", 254 - strlen(buf));
        dir = alloc_string(buf);
        if (!access(dir, R_OK))
                return dir;
        free_string(dir);
        snprintf(buf, 254, "%s/smatch_data/", SMATCHDATADIR);
        dir = alloc_string(buf);
        if (!access(dir, R_OK))
                return dir;
        printf("Warning: %s is not accessible.\n", dir);
        printf("Use --no-data to suppress this message.\n");
        return NULL;
}

int main(int argc, char **argv)
{
        int i;
        reg_func func;

        parse_args(&argc, &argv);

        data_dir = get_data_dir(argv[0]);

        create_function_hook_hash();
        open_smatch_db();
        for (i = 0; i < ARRAY_SIZE(reg_funcs); i++) {
                func = reg_funcs[i].func;
                /* The script IDs start at 1.
                   0 is used for internal stuff. */
                func(i + 1);
        }
        register_function_hooks(-1);

        smatch(argc, argv);
        free_string(data_dir);
        return 0;
}