查找指定文件中特定字符串赋值_找出文本中制定字符并赋值-优快云博客

本文展示了一个C语言程序示例，该程序用于从名为Sets.conf的配置文件中读取特定字段“NetworkDevice”下的“DeviceName”的值，并打印出来。程序首先获取文件大小，然后读取文件内容并解析所需的字段。

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <linux/kernel.h>

static unsigned long get_file_size(const char *path)
{
    struct stat statbuff;
    if(stat(path, &statbuff) >= 0){
        return statbuff.st_size;
    }
    return -1;
}

static unsigned int print_network_name(void)
{
    int fd = -1;
    int size = 0;
    int i = 0;
    char buf[100];
    char strBuf[100];
    char *p;
    unsigned long fileSize = get_file_size("./Sets.conf");
    char *buffer = (char *)malloc(fileSize + 1);
    char *tmpBuf = (char *)malloc(fileSize + 1);
    if(NULL == buffer || NULL == tmpBuf)
    {
        printf("%s malloc error \n", __func__);
        return -1;
    }
    fd = open("./Sets.conf", O_RDONLY);
    if(-1 == fd)
    {
        printf("%s open error \n", __func__);
        return -1;
    }
    size = read(fd, buffer, fileSize);
    if(size != fileSize)
    {
        printf("%s read file len error \n", __func__);
        close(fd);
        return -1;
    }
   close(fd);

    p = strstr(buffer, "NetworkDevice");
    memcpy(tmpBuf, p, (unsigned int)((p - buffer)/sizeof(char)));
    p = strstr(tmpBuf, "DeviceName");
    p += sizeof("DeviceName");
    while(*p != '\n')
    {
        buf[i] = *p;
        i++;
        p++;
    }
    buf[i] = '\0';

    free(buffer);
    free(tmpBuf);

    memset(strBuf, 0xff, 100);
    sprintf(strBuf, "NetworkName : %s", buf);
    printf("%s \n", strBuf);

    return 0;
}

void main(void)