annotate toys/tail.c @ 562:4d802d438983

Match uint64_t with PRIu64 to avoid warnings on 64 bit builds.
author Rob Landley <rob@landley.net>
date Sat, 14 Apr 2012 21:27:00 -0500
parents c2f39708a4c4
children 47edfc1a4983
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 *
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7 * See http://www.opengroup.org/onlinepubs/009695399/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
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32 #include "toys.h"
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33
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34 DEFINE_GLOBALS(
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35 long lines;
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36 long bytes;
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37
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38 int file_no;
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39 )
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40
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41 #define TT this.tail
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42
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43 #define FLAG_n 1
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44 #define FLAG_c 2
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45 #define FLAG_f 4
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46
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47 struct line_list {
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48 struct line_list *next, *prev;
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49 char *data;
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50 int len;
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51 };
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52
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53 static struct line_list *get_chunk(int fd, int len)
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54 {
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55 struct line_list *line = xmalloc(sizeof(struct line_list)+len);
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56
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57 line->data = ((char *)line) + sizeof(struct line_list);
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58 line->len = readall(fd, line->data, len);
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59
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60 if (line->len < 1) {
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61 free(line);
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62 return 0;
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63 }
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64
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65 return line;
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66 }
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67
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68 static void dump_chunk(void *ptr)
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69 {
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70 struct line_list *list = ptr;
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71 xwrite(1, list->data, list->len);
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72 free(list);
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73 }
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74
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75 // Reading through very large files is slow. Using lseek can speed things
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76 // up a lot, but isn't applicable to all input (cat | tail).
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77 // Note: bytes and lines are negative here.
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78 static int try_lseek(int fd, long bytes, long lines)
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79 {
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80 struct line_list *list = 0, *temp;
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81 int flag = 0, chunk = sizeof(toybuf);
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82 ssize_t pos = lseek(fd, 0, SEEK_END);
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83
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84 // If lseek() doesn't work on this stream, return now.
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85 if (pos<0) return 0;
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86
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87 // Seek to the right spot, output data from there.
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88 if (bytes) {
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89 if (lseek(fd, bytes, SEEK_END)<0) lseek(fd, 0, SEEK_SET);
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90 xsendfile(fd, 1);
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91 return 1;
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92 }
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93
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94 // Read from end to find enough lines, then output them.
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95
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96 bytes = pos;
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97 while (lines && pos) {
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98 int offset;
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99
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100 // Read in next chunk from end of file
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101 if (chunk>pos) chunk = pos;
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102 pos -= chunk;
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103 if (pos != lseek(fd, pos, SEEK_SET)) {
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104 perror_msg("seek failed");
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105 break;
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106 }
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107 if (!(temp = get_chunk(fd, chunk))) break;
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108 if (list) list->next = temp;
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109 list = temp;
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110
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111 // Count newlines in this chunk.
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112 offset = list->len;
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113 while (offset--) {
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114 // If the last line ends with a newline, that one doesn't count.
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115 if (!flag) {
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116 flag++;
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117
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 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
119 }
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
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 // 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
122 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
123 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
124 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.
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parents: 504
diff changeset
125 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.
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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 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.
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parents: 504
diff changeset
128 }
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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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.
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parents: 504
diff changeset
130 }
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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parents: 504
diff changeset
131
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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parents: 504
diff changeset
132 // Output stored data
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parents: 504
diff changeset
133 llist_free(list, dump_chunk);
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parents: 504
diff changeset
134
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parents: 504
diff changeset
135 // 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.
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parents: 504
diff changeset
136 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.
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parents: 504
diff changeset
137 return 1;
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
138 }
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
139
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.
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parents: 504
diff changeset
140 // Called for each file listed on command line, and/or stdin
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
141 static void do_tail(int fd, char *name)
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
142 {
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.
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parents: 504
diff changeset
143 long bytes = TT.bytes, lines = TT.lines;
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
144
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
145 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
146 if (TT.file_no++) xputc('\n');
494
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
147 xprintf("==> %s <==\n", name);
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
148 }
eebfb11e84db Add tail.
Timothy Elliott <tle@holymonkey.com>
parents:
diff changeset
149
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.
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parents: 504
diff changeset
150 // 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.
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parents: 504
diff changeset
151
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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parents: 504
diff changeset
152 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.
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parents: 504
diff changeset
153 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.
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parents: 504
diff changeset
154
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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parents: 504
diff changeset
155 // 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.
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parents: 504
diff changeset
156 // 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.
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parents: 504
diff changeset
157 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.
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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.
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parents: 504
diff changeset
159 // 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.
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parents: 504
diff changeset
160 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.
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parents: 504
diff changeset
161 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.
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parents: 504
diff changeset
162 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.
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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 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.
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parents: 504
diff changeset
165 // 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.
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parents: 504
diff changeset
166 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.
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parents: 504
diff changeset
167 (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.
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parents: 504
diff changeset
168
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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parents: 504
diff changeset
169 // 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.
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parents: 504
diff changeset
170 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.
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parents: 504
diff changeset
171 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.
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parents: 504
diff changeset
172 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
173 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
174 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
175 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
176 }
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
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 if (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
179 if(try[count] != '\n') 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
180 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
181 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
182 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
183 }
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 }
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
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 // 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
187 // 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
188 // 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
189 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
190 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
191 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
192 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
193 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
194 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
195 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
196 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
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 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
199 } 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
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 }
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
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 // Output/free the 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
204 llist_free(list, dump_chunk);
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
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 // 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
207 } 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
208 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
209
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 // 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
211 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
212 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
213 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
214 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
215 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
216 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
217 }
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
218 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
219 }
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
220
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
221 // -f support: cache name/descriptor
494
eebfb11e84db Add tail.
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222 }
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223
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224 void tail_main(void)
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225 {
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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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226 // if nothing specified, default -n to -10
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227 if (!(toys.optflags&(FLAG_n|FLAG_c))) TT.lines = -10;
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228
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229 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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230
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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231 // do -f stuff
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232 }