Mercurial > hg > toybox
diff lib/lib.c @ 1070:16167a7c1b5a draft
Fix -t c0 and -J as reported by heehooman at gmail on the list.
Also fix up help text, and hook up -c.
author | Rob Landley <rob@landley.net> |
---|---|
date | Mon, 16 Sep 2013 23:41:51 -0500 |
parents | acf7bb2b99e2 |
children | 54b2776de2f4 |
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--- a/lib/lib.c Wed Sep 18 10:50:38 2013 -0500 +++ b/lib/lib.c Mon Sep 16 23:41:51 2013 -0500 @@ -89,24 +89,31 @@ return count; } +// skip this many bytes of input. Return 0 for success, >0 means this much +// left after input skipped. off_t lskip(int fd, off_t offset) { - off_t and = lseek(fd, offset, SEEK_CUR); + off_t cur = lseek(fd, 0, SEEK_CUR); + + if (cur != -1) { + off_t end = lseek(fd, 0, SEEK_END) - cur; - if (and != -1 && offset >= lseek(fd, offset, SEEK_END) - && offset+and == lseek(fd, offset+and, SEEK_SET)) return 0; - else { - while (offset>0) { - int try = offset>sizeof(libbuf) ? sizeof(libbuf) : offset, or; + if (end > 0 && end < offset) return offset - end; + end = offset+cur; + if (end == lseek(fd, end, SEEK_SET)) return 0; + perror_exit("lseek"); + } - or = readall(fd, libbuf, try); - if (or < 0) perror_msg("lskip to %lld", (long long)offset); - else offset -= try; - if (or < try) break; - } + while (offset>0) { + int try = offset>sizeof(libbuf) ? sizeof(libbuf) : offset, or; - return offset; + or = readall(fd, libbuf, try); + if (or < 0) perror_exit("lskip to %lld", (long long)offset); + else offset -= try; + if (or < try) break; } + + return offset; } // Split a path into linked list of components, tracking head and tail of list.