write_or_die.c

   1 #include "cache.h"
   2
   3 void read_or_die(int fd, void *buf, size_t count)
   4 {
   5         char *p = buf;
   6         ssize_t loaded;
   7
   8         while (count > 0) {
   9                 loaded = xread(fd, p, count);
  10                 if (loaded == 0)
  11                         die("unexpected end of file");
  12                 else if (loaded < 0)
  13                         die("read error (%s)", strerror(errno));
  14                 count -= loaded;
  15                 p += loaded;
  16         }
  17 }
  18
  19 void write_or_die(int fd, const void *buf, size_t count)
  20 {
  21         const char *p = buf;
  22         ssize_t written;
  23
  24         while (count > 0) {
  25                 written = xwrite(fd, p, count);
  26                 if (written == 0)
  27                         die("disk full?");
  28                 else if (written < 0) {
  29                         if (errno == EPIPE)
  30                                 exit(0);
  31                         die("write error (%s)", strerror(errno));
  32                 }
  33                 count -= written;
  34                 p += written;
  35         }
  36 }
  37
  38 int write_in_full(int fd, const void *buf, size_t count)
  39 {
  40         const char *p = buf;
  41         ssize_t total = 0;
  42         ssize_t wcount = 0;
  43
  44         while (count > 0) {
  45                 wcount = xwrite(fd, p, count);
  46                 if (wcount <= 0) {
  47                         if (total)
  48                                 return total;
  49                         else
  50                                 return wcount;
  51                 }
  52                 count -= wcount;
  53                 p += wcount;
  54                 total += wcount;
  55         }
  56
  57         return wcount;
  58 }
  59
  60 int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
  61 {
  62         ssize_t written;
  63
  64         written = write_in_full(fd, buf, count);
  65         if (written == 0) {
  66                 fprintf(stderr, "%s: disk full?\n", msg);
  67                 return 0;
  68         }
  69         else if (written < 0) {
  70                 if (errno == EPIPE)
  71                         exit(0);
  72                 fprintf(stderr, "%s: write error (%s)\n",
  73                         msg, strerror(errno));
  74                 return 0;
  75         }
  76
  77         return 1;
  78 }
  79
  80 int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
  81 {
  82         ssize_t written;
  83
  84         written = write_in_full(fd, buf, count);
  85         if (written == 0) {
  86                 fprintf(stderr, "%s: disk full?\n", msg);
  87                 return 0;
  88         }
  89         else if (written < 0) {
  90                 fprintf(stderr, "%s: write error (%s)\n",
  91                         msg, strerror(errno));
  92                 return 0;
  93         }
  94
  95         return 1;
  96 }