blind-split-cols.c (1171B)
1 /* See LICENSE file for copyright and license details. */ 2 #include "common.h" 3 4 USAGE("(file columns) ...") 5 6 int 7 main(int argc, char *argv[]) 8 { 9 struct stream stream; 10 size_t *cols, period = 0, parts, i; 11 int *fds; 12 13 UNOFLAGS(argc % 2 || !argc); 14 15 eopen_stream(&stream, NULL); 16 17 parts = (size_t)argc / 2; 18 cols = alloca(parts * sizeof(*cols)); 19 fds = alloca(parts * sizeof(*fds)); 20 21 for (i = 0; i < parts; i++) { 22 fds[i] = eopen(argv[i * 2], O_WRONLY | O_CREAT | O_TRUNC, 0666); 23 cols[i] = etozu_arg("columns", argv[i * 2 + 1], 1, SIZE_MAX); 24 } 25 for (i = 0; i < parts; i++) { 26 if (cols[i] > SIZE_MAX - period) 27 goto bad_col_count; 28 period += cols[i]; 29 } 30 if (period != stream.width) 31 goto bad_col_count; 32 33 for (i = 0; i < parts; i++) 34 if (DPRINTF_HEAD(fds[i], stream.frames, cols[i], stream.height, stream.pixfmt) < 0) 35 eprintf("dprintf %s:", argv[i * 2]); 36 for (i = 0; i < parts; i++, i = i == parts ? 0 : i) 37 if (esend_pixels(&stream, fds[i], cols[i], argv[i * 2]) != cols[i]) 38 break; 39 for (i = 0; i < parts; i++) 40 close(fds[i]); 41 42 return 0; 43 44 bad_col_count: 45 eprintf("the sum of all columns must add up to the width of the input video\n"); 46 return 1; 47 }