larbin中write的用法

// Larbin
// Sebastien Ailleret
// 15-11-99 -> 03-05-01

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <ctype.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <errno.h>
#include <iostream.h>

#include "options.h"


/*********************************/
/* various functions for writing */

/* make write until everything is written
 * return 0 on success, 1 otherwise
 * Don't work on non-blocking fds...
 */
int ecrire (int fd, char *buf) {
  int pos = 0;
  int count = strlen(buf);
  while (pos < count) {
    int i = write(fd, buf + pos, count-pos);
    if (i == -1) {
      if (errno != EINTR) {
		pos = count + 1;
      }
    } else {
      pos += i;
    }
  }
  return pos != count;
}

/* make write until everything is written
 * return 0 on success, 1 otherwise
 * Don't work on non-blocking fds...
 */
int ecrireBuff (int fd, char *buf, int count) {
  int pos = 0;
  while (pos < count) {
    int i = write(fd, buf + pos, count-pos);
    if (i == -1) {
      switch (errno) {
      case EINTR:
        break;
      default:
        pos = count + 1;
        perror("Problem in ecrireBuff");
        break;
      }
    } else {
      pos += i;
    }
  }
  return pos != count;
}



/** Write an int on a fds
 * (uses ecrire)
 */
int ecrireInt (int fd, int i) {
  char buf[20];
  sprintf(buf, "%d", i);
  return ecrire(fd, buf);
}

int ecrireInt2 (int fd, int i) {
  char buf[20];
  sprintf(buf, "%d%c", i/10, i%10 + '0');
  return ecrire(fd, buf);
}

int ecrireInti (int fd, int i, char *f) {
  char buf[100];
  sprintf(buf, f, i);
  return ecrire(fd, buf);
}

int ecrireIntl (int fd, long i, char *f) {
  char buf[100];
  sprintf(buf, f, i);
  return ecrire(fd, buf);
}

/** Write an int on a fds
 * (uses ecrire)
 */
int ecrireLong (int fd, long i) {
  char buf[30];
  sprintf(buf, "%ld", i);
  return ecrire(fd, buf);
}

/* Write a char on a fds
 * return 0 on success, 1 otherwise
 * Don't work on non-blocking fds...
 */
int ecrireChar (int fd, char c) {
  int pos = 0;
  while (pos < 1) {
    int i = write(fd, &c, 1);
    if (i == -1) {
      if (errno != EINTR) {
		pos = 2;
      }
    } else {
      pos += i;
    }
  }
  return pos != 1;
}