src/lib/read-full.c

/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "read-full.h"

#include <unistd.h>

int read_full(int fd, void *data, size_t size)
{
    ssize_t ret;

    while (size > 0) {
        ret = read(fd, data, size < SSIZE_T_MAX ? size : SSIZE_T_MAX);
        if (ret <= 0)
            return ret;

        data = PTR_OFFSET(data, ret);
        size -= ret;
    }

    return 1;
}

int pread_full(int fd, void *data, size_t size, off_t offset)
{
    ssize_t ret;

    while (size > 0) {
        ret = pread(fd, data, size < SSIZE_T_MAX ?
                size : SSIZE_T_MAX, offset);
        if (ret <= 0)
            return ret;

        data = PTR_OFFSET(data, ret);
        size -= ret;
        offset += ret;
    }

    return 1;
}