小编use*_*007的帖子

const int buf_length = 255;
char buf[ buf_length + 1 ];

snprintf(buf, buf_length, "%d Next on [%s] %s:", channel, station_channel(channel), station_name(channel));

strncat(buf, "(", buf_length - strlen (buf));
strncat(buf, station_country( xmltv ), buf_length - strlen(buf));
strncat(buf, ")", buf_length - strlen (buf));

country_list_set_text( buf );

这得到警告:

可变长度数组折叠为常量数组作为扩展名.

你能帮忙解决这个问题吗？

我使用下面的代码:

char filename[ 255 ];
strncpy( filename, getenv( "HOME" ), 235 );
strncat( filename, "/.config/stationlist.xml", 255 );

收到此消息:

(warning) Dangerous usage of strncat - 3rd parameter is the maximum number of characters to append.
(error) Dangerous usage of 'filename' (strncpy doesn't always null-terminate it).

我正在用C进行学习，无法识别内存泄漏情况

当我使用cppcheck检查代码时：get（错误）资源泄漏：f

enum bus_type {
    MEDIA_BUS_UNKNOWN,
    MEDIA_BUS_VIRTUAL,
    MEDIA_BUS_PCI,
    MEDIA_BUS_USB,
};

static enum bus_type get_bus(char *device)
{
        char file[PATH_MAX];
        char s[1024];
        FILE *f;

        if (!strcmp(device, "/sys/devices/virtual"))
                return MEDIA_BUS_VIRTUAL;

        snprintf(file, PATH_MAX, "%s/modalias", device);
        f = fopen(file, "r");
        if (!f)
                return MEDIA_BUS_UNKNOWN;
        if (!fgets(s, sizeof(s), f))       /* <-- (error) Resource leak: f */
                return MEDIA_BUS_UNKNOWN;
        fclose(f);

        if (!strncmp(s, "pci", 3))
                return MEDIA_BUS_PCI;
        if (!strncmp(s, "usb", 3))
                return MEDIA_BUS_USB;

        return MEDIA_BUS_UNKNOWN;
}

我觉得我在内存管理方面缺少一些东西。

我想在我的代码中用nanosleep替换过时的usleep函数:

static int timediff( struct timeval *large, struct timeval *small )
{
        return (   ( ( large->tv_sec * 1000 * 1000 ) + large->tv_usec )
                 - ( ( small->tv_sec * 1000 * 1000 ) + small->tv_usec ) );
}

struct performance_s
{
        struct timeval acquired_input;
};

performance_t *performance_new( int fieldtimeus )
{
     performance_t *perf = malloc( sizeof( performance_t ) );
     if( !perf ) return 0;

     gettimeofday( &perf->acquired_input, 0 );

     return perf;
}

performance_t *perf = 0;

int performance_get_usecs_since_frame_acquired( performance_t *perf …

每次调用strtok_r()(从字符串中提取标记)后,我不应该释放s_ptr吗？

static void get_uevent_info(struct media_device_entry *md_ptr, char *dname)
{
    FILE *fd;
    char file[PATH_MAX], *name, *p;
    char s[1024];
    char *s_ptr;

    snprintf(file, PATH_MAX, "%s/%s/uevent", dname, md_ptr->node);
    fd = fopen(file, "r");
    if (!fd)
            return;
    while (fgets(s, sizeof(s), fd)) {
            p = strtok_r(s, "=", &s_ptr);
            if (!p)
                    continue;
            name = p;
            p = strtok_r(NULL, "\n", &s_ptr);
            if (!p)
                    continue;
            if (!strcmp(name, "MAJOR"))
                    md_ptr->major = atol(p);
            else if (!strcmp(name, "MINOR"))
                    md_ptr->minor = atol(p);
    }

    fclose(fd);
}

我从未使用过这个功能,所以也许我错了.

最好的祝福.

我完全陷入了困境.我在3个文件中有以下代码:

文件mixer_oss.c

#include "mixer.h"

static char *devices[] = SOUND_DEVICE_NAMES;

static char **oss_get_device(void)
{
    int i, o, devs, res;
    char **result;

    if ((ioctl(fd, SOUND_MIXER_READ_RECMASK, &devs)) == -1) {
        return NULL;
    } else {
        result = malloc(sizeof(char*)*SOUND_MIXER_NRDEVICES);
        o = 0;
        for (i=0; i < SOUND_MIXER_NRDEVICES; i++) {
                res = (devs >> i)%2;
                if (res) {
                    result[o] = malloc(strlen(devices[i])+1);
                    sprintf(result[o], "%s", devices[i]); 
                    o++;
                }
                result[o] = NULL;   
            }
    }

    return result;
}

struct mixer oss_mixer = {
    .get_device = oss_get_device,
};

文件mixer.h

#ifdef …

我有以下代码从命令行读取参数.如果字符串是这种形式hw:1,0我想打破.

gboolean parse_one_option (gint opt, const gchar * arg, GError ** err)
{
    switch (opt) {
    case DEVICE:
        if (!strncmp(arg, "hw:", 3) && isdigit(arg[3]) && arg[4] == ',' && isdigit(arg[5])) {
            char *device = g_strdup (arg);
            break;
        break;

编译器给了我一个警告:

warning: implicit declaration of function 'isdigit' is invalid in C99 [-Wimplicit-function-declaration]
                    if (!strncmp(arg, "hw:", 3) && isdigit(arg[3]) && arg[4] == ',' && isdigit(arg[5])) {
                                                   ^

还有一个问题:

将g_strdup与GOptionContext结合使用是正确的