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#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include "io.h"
int read_all(int fd, unsigned char *buf, size_t len) {
ssize_t nbytes;
while (len > 0) {
nbytes = read(fd, buf, len);
if (nbytes == 0) { errno = EPIPE; return -1; }
if (nbytes < 0 && errno == EINTR) continue;
if (nbytes < 0) return -1;
buf += nbytes;
len -= nbytes;
}
return 0;
}
int read_some(int fd, unsigned char *buf, size_t *lenp) {
ssize_t nbytes;
do nbytes = read(fd, buf, *lenp);
while (nbytes < 0 && errno == EINTR);
if (nbytes == 0) { errno = EPIPE; return -1; }
if (nbytes < 0) return -1;
*lenp = nbytes;
return 0;
}
int write_all(int fd, const unsigned char *buf, size_t count) {
ssize_t nbytes;
while (count > 0) {
nbytes = write(fd, buf, count);
if (nbytes < 0 && errno == EINTR) continue;
if (nbytes < 0) return -1;
buf += nbytes;
count -= nbytes;
}
return 0;
}
ssize_t read_file(char *buf, size_t len, const char *fmt, ...) {
va_list ap;
int rc;
struct stat st;
int fd;
va_start(ap, fmt);
rc = vsnprintf(buf, len, fmt, ap);
va_end(ap);
if (rc < 0) return -1;
if ((size_t)rc >= len) { errno = ENAMETOOLONG; return -1; }
rc = stat(buf, &st);
if (rc < 0) return -1;
if ((size_t)st.st_size > len-1) { errno = EMSGSIZE; return -1; }
fd = open(buf, O_RDONLY);
if (fd < 0) return -1;
rc = read_all(fd, buf, st.st_size);
if (rc < 0) return -1;
buf[(size_t)st.st_size] = '\0';
close(fd);
return st.st_size;
}
int tcp_connect(const char *host, const char *port, const char **errp) {
struct addrinfo hints;
struct addrinfo *result, *rp;
int s;
int fd;
int err;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_protocol = IPPROTO_TCP;
if (host && host[0] == '\0') host = NULL;
s = getaddrinfo(host, port, &hints, &result);
if (s < 0) {
*errp = gai_strerror(s);
return -1;
}
for (rp = result; rp; rp = rp->ai_next) {
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (fd < 0) continue;
if (connect(fd, rp->ai_addr, rp->ai_addrlen) == 0) break;
err = errno;
close(fd);
errno = err;
}
if (rp == NULL) fd = -1;
freeaddrinfo(result);
return fd;
}
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