blind-split-rows.c - blind - suckless command-line video editing utility
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       ---
       blind-split-rows.c (1161B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "common.h"
            3 
            4 USAGE("(file rows) ...")
            5 
            6 int
            7 main(int argc, char *argv[])
            8 {
            9         struct stream stream;
           10         size_t *rows, 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         rows  = alloca(parts * sizeof(*rows));
           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                 rows[i] = etozu_arg("rows", argv[i * 2 + 1], 1, SIZE_MAX);
           24         }
           25         for (i = 0; i < parts; i++) {
           26                 if (rows[i] > SIZE_MAX - period)
           27                         goto bad_row_count;
           28                 period += rows[i];
           29         }
           30         if (period != stream.height)
           31                 goto bad_row_count;
           32 
           33         for (i = 0; i < parts; i++)
           34                 if (DPRINTF_HEAD(fds[i], stream.frames, stream.width, rows[i], 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_rows(&stream, fds[i], rows[i], argv[i * 2]) != rows[i])
           38                         break;
           39         for (i = 0; i < parts; i++)
           40                 close(fds[i]);
           41 
           42         return 0;
           43 
           44 bad_row_count:
           45         eprintf("the sum of all rows must add up to the height of the input video\n");
           46         return 1;
           47 }