diff options
| -rw-r--r-- | toys/head.c | 62 | ||||
| -rw-r--r-- | toys/nice.c | 2 |
2 files changed, 62 insertions, 2 deletions
diff --git a/toys/head.c b/toys/head.c new file mode 100644 index 00000000..8f0baa24 --- /dev/null +++ b/toys/head.c @@ -0,0 +1,62 @@ +/* vi: set sw=4 ts=4: + * + * head.c - copy first lines from input to stdout. + * + * Copyright 2006 Timothy Elliott <tle@holymonkey.com> + * + * See http://www.opengroup.org/onlinepubs/009695399/utilities/head.html + +USE_HEAD(NEWTOY(head, "n#", TOYFLAG_BIN)) + +config HEAD + bool "head" + default y + help + usage: head [-n number] [file...] + Copy first lines from files to stdout. If no files listed, copy from + stdin. Filename "-" is a synonym for stdin. + + -n Number of lines to copy. +*/ + +#include "toys.h" + +DEFINE_GLOBALS( + long lines; + int file_no; +) + +#define TT this.head + +static void do_head(int fd, char *name) +{ + int i, len, lines=TT.lines, size=sizeof(toybuf); + + if (toys.optc > 1) { + // Print an extra newline for all but the first file + if (TT.file_no++ > 0) printf("\n"); + printf("==> %s <==\n", name); + } + + for (;lines>0;) { + len = read(fd, toybuf, size); + if (len<0) { + perror_msg("%s",name); + toys.exitval = EXIT_FAILURE; + } + if (len<1) break; + + for(i=0; i<len; i++) { + if (toybuf[i] == '\n' && --lines < 1) break; + } + xwrite(1, toybuf, i+1); + } +} + +void head_main(void) +{ + if (!toys.optflags) TT.lines = 10; + if (TT.lines < 0) perror_exit("Invalid number of lines."); + TT.file_no = 0; + loopfiles(toys.optargs, do_head); +} diff --git a/toys/nice.c b/toys/nice.c index 2fda2675..fa059bbd 100644 --- a/toys/nice.c +++ b/toys/nice.c @@ -24,8 +24,6 @@ config NICE #include "toys.h" -// Hello doesn't use these globals, they're here for example/skeleton purposes. - DEFINE_GLOBALS( long priority; ) |