minit

A small yet feature-complete init (http://fefe.de/minit/)
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openreadclose.c (584B)

      1 #ifndef EMBEDDED
      2 #define _FILE_OFFSET_BITS 64
      3 #include <unistd.h>
      4 #include <fcntl.h>
      5 #include <stdlib.h>
      6 #endif
      7 
      8 int openreadclose(char *fn, char **buf, size_t *len) {
      9   int fd=open(fn,O_RDONLY);
     10   if (fd<0) return -1;
     11   if (!*buf) {
     12     off_t o = lseek(fd, 0, SEEK_END);
     13     if (o < 0 || o > 0x7fffffff) goto error;	// impose sanity limits
     14     *len = o;
     15     *buf=(char*)malloc(*len+1);
     16     if (!*buf) {
     17 error:
     18       close(fd);
     19       return -1;
     20     }
     21   }
     22   *len=pread(fd,*buf,*len,0);
     23   if (*len == (unsigned long)-1)
     24     (*buf)[0]=0;
     25   else
     26     (*buf)[*len]=0;
     27   return close(fd);
     28 }