dive/safer.c at master · vi/dive · GitHub

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#include <unistd.h>
#include <errno.h>

int safer_write(int f, const char* b, int n) {
    int acc = 0;
    while(n) {
        int r = write(f, b, n);
        if(!r) return acc;
        if(r==-1) {
            if (errno==EINTR || errno==EAGAIN) continue;
            return -1;
        }
        n-=r;
        b+=r;
        acc+=r;
    }
    return acc;
}

int safer_read(int f, char* b, int n) {
    int acc = 0;
    while(n) {
        int r = read(f, b, n);
        if(!r) return acc;
        if(r==-1) {
            if (errno==EINTR || errno==EAGAIN) continue;
            return -1;
        }
        n-=r;
        b+=r;
        acc+=r;
    }
    return acc;
}