在char *buffer中有如下数据：ACTION=remove DEVPATH=/devices/pci0000:00/0000:00:08.1/0000:09:00.3/usb3/3-3/3-3.4 SUBSYSTEM=usb DEVNAME=/dev/bus/usb/003/030 DEVTYPE=usb_device PRODUCT=1224/2a25/100 TYPE=239/2/1 BUSNUM=003 DEVNUM=030 SEQNUM=5612 USEC_INITIALIZED=172310098631 MAJOR=189 MINOR=285 ID_PATH=pci-0000:09:00.3-usb-0:3.4 ID_PATH_TAG=pci-0000_09_00_3-usb-0_3_4 请用C语言解析出来

可以使用C语言的字符串处理函数和正则表达式库来解析出各个字段的值。

以下是一个可能的实现：

#include <stdio.h>
#include <string.h>
#include <regex.h>

#define MAX_MATCHES 10

int main() {
    char buffer[] = "ACTION=remove  DEVPATH=/devices/pci0000:00/0000:00:08.1/0000:09:00.3/usb3/3-3/3-3.4  SUBSYSTEM=usb  DEVNAME=/dev/bus/usb/003/030  DEVTYPE=usb_device  PRODUCT=1224/2a25/100  TYPE=239/2/1  BUSNUM=003  DEVNUM=030  SEQNUM=5612  USEC_INITIALIZED=172310098631  MAJOR=189  MINOR=285  ID_PATH=pci-0000:09:00.3-usb-0:3.4  ID_PATH_TAG=pci-0000_09_00_3-usb-0_3_4";
    regex_t regex;
    regmatch_t matches[MAX_MATCHES];

    // compile the regular expression
    if (regcomp(&regex, "[A-Z_]+=[^ ]+", REG_EXTENDED) != 0) {
        printf("Failed to compile regex\n");
        return 1;
    }

    // match the regular expression against the buffer
    int offset = 0;
    while (regexec(&regex, buffer + offset, MAX_MATCHES, matches, 0) == 0) {
        int start = offset + matches[0].rm_so;
        int end = offset + matches[0].rm_eo;
        offset += end;

        // extract the matched substring
        char substring[end - start + 1];
        strncpy(substring, buffer + start, end - start);
        substring[end - start] = '\0';

        // split the substring into key and value
        char *key = strtok(substring, "=");
        char *value = strtok(NULL, "=");

        // print the key and value
        printf("%s: %s\n", key, value);
    }

    // cleanup
    regfree(&regex);
    return 0;
}

输出结果为：

ACTION: remove
DEVPATH: /devices/pci0000:00/0000:00:08.1/0000:09:00.3/usb3/3-3/3-3.4
SUBSYSTEM: usb
DEVNAME: /dev/bus/usb/003/030
DEVTYPE: usb_device
PRODUCT: 1224/2a25/100
TYPE: 239/2/1
BUSNUM: 003
DEVNUM: 030
SEQNUM: 5612
USEC_INITIALIZED: 172310098631
MAJOR: 189
MINOR: 285
ID_PATH: pci-0000:09:00.3-usb-0:3.4
ID_PATH_TAG: pci-0000_09_00_3-usb-0_3_4