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	file.c - spoon - set dwm status
	git clone git://git.codemadness.org/spoon
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	---
	file.c (604B)
	---
	1 #include <err.h>
	2 #include <fcntl.h>
	3 #include <unistd.h>
	4
	5 ssize_t
	6 readn(int fd, void *buf, size_t nbytes)
	7 {
	8 size_t nleft = nbytes;
	9 ssize_t n;
	10
	11 do {
	12 n = read(fd, buf, nleft);
	13 if (n == 0)
	14 break;
	15 else if (n == -1)
	16 return -1;
	17 nleft -= n;
	18 buf += n;
	19 } while (nleft > 0);
	20 return (nbytes - nleft);
	21 }
	22
	23 int
	24 fileread(void arg, char buf, size_t len)
	25 {
	26 char *path = arg;
	27 ssize_t n;
	28 int fd;
	29
	30 fd = open(path, O_RDONLY);
	31 if (fd == -1) {
	32 warn("open %s", path);
	33 return -1;
	34 }
	35 n = readn(fd, buf, len);
	36 close(fd);
	37 if (n == -1 \|\| n == 0)
	38 return -1;
	39 else
	40 buf[n - 1] = '\0';
	41 return 0;
	42 }