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annotate toys/posix/tail.c @ 674:7e846e281e38

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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author Rob Landley <rob@landley.net>
date Mon, 08 Oct 2012 00:02:30 -0500
parents 6df4ccc0acbe
children 786841fdb1e0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
494
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * tail.c - copy last lines from input to stdout.
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4 *
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5 * Copyright 2012 Timothy Elliott <tle@holymonkey.com>
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6 *
656
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/tail.html
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8
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9 USE_TAIL(NEWTOY(tail, "fc-n-", TOYFLAG_BIN))
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10
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11 config TAIL
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12 bool "tail"
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13 default y
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14 help
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15 usage: tail [-n|c number] [-f] [file...]
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16
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17 Copy last lines from files to stdout. If no files listed, copy from
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18 stdin. Filename "-" is a synonym for stdin.
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19
504
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20 -n output the last X lines (default 10), +X counts from start.
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21 -c output the last X bytes, +X counts from start
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22 -f follow file, waiting for more data to be appended
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23
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24 config TAIL_SEEK
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25 bool "tail seek support"
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26 default y
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27 depends on TAIL
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28 help
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29 This version uses lseek, which is faster on large files.
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30 */
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31
674
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32 #define FOR_tail
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33 #include "toys.h"
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34
674
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35 GLOBALS(
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36 long lines;
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37 long bytes;
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38
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39 int file_no;
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40 )
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41
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42 struct line_list {
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43 struct line_list *next, *prev;
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44 char *data;
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45 int len;
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46 };
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47
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48 static struct line_list *get_chunk(int fd, int len)
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49 {
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50 struct line_list *line = xmalloc(sizeof(struct line_list)+len);
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51
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52 line->data = ((char *)line) + sizeof(struct line_list);
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53 line->len = readall(fd, line->data, len);
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54
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55 if (line->len < 1) {
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56 free(line);
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57 return 0;
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58 }
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59
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60 return line;
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61 }
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62
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63 static void dump_chunk(void *ptr)
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64 {
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65 struct line_list *list = ptr;
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66 xwrite(1, list->data, list->len);
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67 free(list);
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68 }
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69
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70 // Reading through very large files is slow. Using lseek can speed things
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71 // up a lot, but isn't applicable to all input (cat | tail).
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72 // Note: bytes and lines are negative here.
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73 static int try_lseek(int fd, long bytes, long lines)
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74 {
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75 struct line_list *list = 0, *temp;
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76 int flag = 0, chunk = sizeof(toybuf);
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77 ssize_t pos = lseek(fd, 0, SEEK_END);
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78
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79 // If lseek() doesn't work on this stream, return now.
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80 if (pos<0) return 0;
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81
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82 // Seek to the right spot, output data from there.
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83 if (bytes) {
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84 if (lseek(fd, bytes, SEEK_END)<0) lseek(fd, 0, SEEK_SET);
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85 xsendfile(fd, 1);
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86 return 1;
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87 }
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88
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89 // Read from end to find enough lines, then output them.
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90
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91 bytes = pos;
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92 while (lines && pos) {
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93 int offset;
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94
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95 // Read in next chunk from end of file
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96 if (chunk>pos) chunk = pos;
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97 pos -= chunk;
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98 if (pos != lseek(fd, pos, SEEK_SET)) {
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99 perror_msg("seek failed");
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100 break;
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101 }
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102 if (!(temp = get_chunk(fd, chunk))) break;
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103 if (list) list->next = temp;
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104 list = temp;
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105
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106 // Count newlines in this chunk.
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107 offset = list->len;
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108 while (offset--) {
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109 // If the last line ends with a newline, that one doesn't count.
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110 if (!flag) {
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111 flag++;
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112
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diff changeset
113 continue;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
114 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
115
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
116 // Start outputting data right after newline
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
117 if (list->data[offset] == '\n' && !++lines) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
118 offset++;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
119 list->data += offset;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
120 list->len -= offset;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
121
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
122 break;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
123 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
124 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
125 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
126
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
127 // Output stored data
624
1e8b9acdafeb Genericize llist code a bit: rename llist_free() to llist_traverse(), and no longer accept NULL as a synonym for free.
Rob Landley <rob@landley.net>
parents: 619
diff changeset
128 llist_traverse(list, dump_chunk);
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
129
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
130 // In case of -f
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
131 lseek(fd, bytes, SEEK_SET);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
132 return 1;
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
133 }
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
134
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
135 // Called for each file listed on command line, and/or stdin
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
136 static void do_tail(int fd, char *name)
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
137 {
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
138 long bytes = TT.bytes, lines = TT.lines;
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
139
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
140 if (toys.optc > 1) {
504
a497beb97eee Add "-" type to optargs and teach tail.c to use it. Tighten up help text, use xzalloc() and xputc() as appropriate.
Rob Landley <rob@landley.net>
parents: 495
diff changeset
141 if (TT.file_no++) xputc('\n');
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
142 xprintf("==> %s <==\n", name);
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
143 }
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
144
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
145 // Are we measuring from the end of the file?
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
146
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
147 if (bytes<0 || lines<0) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
148 struct line_list *list = 0, *new;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
149
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
150 // The slow codepath is always needed, and can handle all input,
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
151 // so make lseek support optional.
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
152 if (CFG_TAIL_SEEK && try_lseek(fd, bytes, lines));
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
153
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
154 // Read data until we run out, keep a trailing buffer
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
155 else for (;;) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
156 int len, count;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
157 char *try;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
158
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
159 if (!(new = get_chunk(fd, sizeof(toybuf)))) break;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
160 // append in order
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
161 dlist_add_nomalloc((struct double_list **)&list,
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
162 (struct double_list *)new);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
163
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
164 // Measure new chunk, discarding extra data from buffer
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
165 len = new->len;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
166 try = new->data;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
167 for (count=0; count<len; count++) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
168 if ((toys.optflags & FLAG_c) && bytes) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
169 bytes++;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
170 continue;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
171 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
172
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
173 if (lines) {
619
47edfc1a4983 - Do not abort testing after running the sort tests
Elie De Brauwer <eliedebrauwer@gmail.com>
parents: 540
diff changeset
174 if(try[count] != '\n' && count != len-1) continue;
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
175 if (lines<0) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
176 if (!++lines) ++lines;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
177 continue;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
178 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
179 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
180
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
181 // Time to discard data; given that bytes and lines were
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
182 // nonzero coming in, we can't discard too much if we're
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
183 // measuring right.
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
184 do {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
185 char c = *(list->data++);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
186 if (!(--list->len)) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
187 struct line_list *next = list->next;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
188 list->prev->next = next;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
189 list->next->prev = list->prev;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
190 free(list);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
191 list = next;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
192 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
193 if (c == '\n') break;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
194 } while (lines);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
195 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
196 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
197
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
198 // Output/free the buffer.
624
1e8b9acdafeb Genericize llist code a bit: rename llist_free() to llist_traverse(), and no longer accept NULL as a synonym for free.
Rob Landley <rob@landley.net>
parents: 619
diff changeset
199 llist_traverse(list, dump_chunk);
540
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
200
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
201 // Measuring from the beginning of the file.
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
202 } else for (;;) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
203 int len, offset = 0;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
204
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
205 // Error while reading does not exit. Error writing does.
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
206 len = read(fd, toybuf, sizeof(toybuf));
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
207 if (len<1) break;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
208 while (bytes > 1 || lines > 1) {
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
209 bytes--;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
210 if (toybuf[offset++] == '\n') lines--;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
211 if (offset >= len) break;
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
212 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
213 if (offset<len) xwrite(1, toybuf+offset, len-offset);
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
214 }
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
215
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
Rob Landley <rob@landley.net>
parents: 504
diff changeset
216 // -f support: cache name/descriptor
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
217 }
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
218
eebfb11e84db Add tail.
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219 void tail_main(void)
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220 {
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a497beb97eee Add "-" type to optargs and teach tail.c to use it. Tighten up help text, use xzalloc() and xputc() as appropriate.
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221 // if nothing specified, default -n to -10
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222 if (!(toys.optflags&(FLAG_n|FLAG_c))) TT.lines = -10;
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223
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224 loopfiles(toys.optargs, do_tail);
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c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
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225
c2f39708a4c4 Redo tail to use optargs and optionally support lseek. Add support to optargs and llist.c, plus add a test suite entry. Still no -f support though.
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226 // do -f stuff
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227 }