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	blind-read-head.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-read-head.c (991B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("")
	5
	6 int
	7 main(int argc, char *argv[])
	8 {
	9 char buf[STREAM_HEAD_MAX];
	10 char magic[] = {'\0', 'u', 'i', 'v', 'f'};
	11 char b, *p;
	12 size_t i, ptr;
	13
	14 UNOFLAGS(argc);
	15
	16 for (ptr = 0; ptr < sizeof(buf);) {
	17 if (!eread(STDIN_FILENO, buf + ptr, 1, "<stdin>"))
	18 goto bad_format;
	19 if (buf[ptr++] == '\n')
	20 break;
	21 }
	22 if (ptr == sizeof(buf))
	23 goto bad_format;
	24
	25 p = buf;
	26 for (i = 0; i < ELEMENTSOF(magic); i++)
	27 if (!eread(STDIN_FILENO, &b, 1, "<stdin>") \|\| b != magic…
	28 goto bad_format;
	29
	30 for (i = 0; i < 3; i++) {
	31 if (!isdigit(*p))
	32 goto bad_format;
	33 while (isdigit(*p)) p++;
	34 if (*p++ != ' ')
	35 goto bad_format;
	36 }
	37 while (isalnum(p) \|\| p == ' ') {
	38 if (p[0] == ' ' && p[-1] == ' ')
	39 goto bad_format;
	40 p++;
	41 }
	42 if (p[-1] == ' ' \|\| p[0] != '\n')
	43 goto bad_format;
	44
	45 ewriteall(STDOUT_FILENO, buf, ptr, "<stdout>");
	46
	47 return 0;
	48 bad_format:
	49 eprintf("<stdin>: file format not supported\n");
	50 }