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root / mainbox / util.c @ 15928a3d

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#include "util.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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char *read_file(const char *filename) {
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  int fd, len, size, nread;
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  char *str;
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  fd = open(filename, O_RDONLY);
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  if (fd < 0) {
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    perror("open");
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    return NULL;
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  }
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  len = 0;
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  size = 64;
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  str = malloc(size);
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  if (!str) {
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    close(fd);
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    return NULL;
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  }
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  while (1) {
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    nread = read(fd, str+len, size-len);
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    len += nread;
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    if (len == size) {
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      size *= 2;
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      str = realloc(str, size);
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      if (!str)
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        return NULL;
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    }
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    if (nread == 0) {
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      str[len] = '\0';
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      close(fd);
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      return str;
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    } else if (nread < 0) {
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      perror("read");
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      free(str);
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      close(fd);
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      return NULL;
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    }
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  }
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}