memchr一个bin文件

Question

我试图在二进制文件中查找0x0D0A.但是strchr在找到0x00时停止并且我没有得到正确的位置.

请告诉我为什么它不起作用

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>

main(){
    FILE *f;
    long size;
    char *buffer;

    f = fopen(filename, "rb");
    if(f==NULL){fputs("File error",stderr); exit(1);}

    // obtain file size
    fseek(f, 0, SEEK_END);
    size = ftell(f);
    rewind(f);

    // allocate memory to contain the whole file
    buffer = (char*) malloc(sizeof(char)*size);
    if(buffer == NULL){fputs("Memory error",stderr); exit(2);}

    // copy the file into the buffer
    if((size_t)fread(buffer,1,size,f) != size){fputs("Reading error",stderr); exit(3);}
    fclose(f);

    // get positions
    char *p;
    p = strchr(buffer, 0x0D0A);
    while(p != NULL){
        printf("found at %d\n", p-buffer-1);
        p = strchr(p+2, 0x0D0A);
    }

    free(buffer);
    return 0;
}

更新

现在if(((char*) memchr(p+1, 0x0A, size))-1 == p)不起作用

int *pos,i=0;
char *p;
p = (char*) memchr(buffer, 0x0D, size);
while(p != NULL){
    if(((char*) memchr(p+1, 0x0A, size))-1 == p){
        pos[i++] = p-buffer-1;
        printf("found at %d\n", pos[i-1]);// check
    }
    p = (char*) memchr(p+2, 0x0D, size);
}

Answer 1

使用memchr查找'\ r',然后测试'\n'是否是下一个字符.