c语言使用指定字符串替换特定的子串

电玩女神 2022-05-16 02:23 406阅读 0赞

# 前言 #

当前程序是在linux环境下执行的

# 代码 #

#include<stdio.h>
    #include<stdlib.h>
    #include<string.h>
    
    #define MAX_UTF8_RES_LEN 1024
    
    int replace_all(char* str, size_t strLen, const char* d, const char* s)
    {
        char* pos = 0;
        char* prv = 0;
        char temp[MAX_UTF8_RES_LEN];
        memset(temp, 0, MAX_UTF8_RES_LEN);
        if(str == NULL || d == NULL || s == NULL)
        {
            printf("Init error\n");
        }
        *temp = 0;
        prv = str;
        pos = strstr(str, d);
        while (pos) {
            strncat(temp, prv, pos - prv);
            pos += strlen(d);
            prv = pos;
            pos = strstr(prv, d);
            strncat(temp, s, MAX_UTF8_RES_LEN - 1 - strlen(temp));
        }
        if (prv != str + strlen(str)) {
            strncat(temp, prv, MAX_UTF8_RES_LEN - 1 - strlen(temp));
        }
        if (strlen(temp) > strLen) {
            printf("Overflow!\n");
            return -1;
        }
        strncpy(str, temp, MAX_UTF8_RES_LEN - 1);
        str[MAX_UTF8_RES_LEN - 1] = '\0';
        return 0;
    }
    
    int
    main(int argc, char* argv[])
    {
        char * line = NULL;
        size_t len = 0;
        ssize_t read_len;
        while ((read_len=getline(&line, &len, stdin)) != -1) 
        {
            if (read_len > 0 && line[read_len-1] == '\n')
            { 
                line[read_len-1] = '\0';
                read_len -= 1;  
            }
            int b = replace_all(line, MAX_UTF8_RES_LEN, "888", "999");
            printf("b is %d\n", b);
            printf("new is %s\n", line);
        }
        return 0;
    }

# 编译 #

gcc demo.cc -g -o demo

# 运行 #

echo "hello 888 asdfa 888888fa889sdfa" | ./demo

# 结果 #

b is 0
    new is hello 999 asdfa 999999fa889sdfa