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annotate toys/posix/tail.c @ 1183:0752b2d58909 draft

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Rename xmsprintf() to just xmprintf(). Partly because there's no supplied target string ala sprintf, and partly because I can never remember what order the m and s go in.
author Rob Landley <rob@landley.net>
date Thu, 16 Jan 2014 09:26:50 -0600
parents ef72a16f4b3a
children 1d996b0a11c0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* tail.c - copy last lines from input to stdout.
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2 *
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3 * Copyright 2012 Timothy Elliott <tle@holymonkey.com>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/tail.html
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6
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7 USE_TAIL(NEWTOY(tail, "fc-n-[-cn]", TOYFLAG_BIN))
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8
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9 config TAIL
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10 bool "tail"
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11 default y
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12 help
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13 usage: tail [-n|c NUMBER] [-f] [FILE...]
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15 Copy last lines from files to stdout. If no files listed, copy from
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16 stdin. Filename "-" is a synonym for stdin.
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18 -n output the last NUMBER lines (default 10), +X counts from start.
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19 -c output the last NUMBER bytes, +NUMBER counts from start
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20 -f follow FILE(s), waiting for more data to be appended
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22 config TAIL_SEEK
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23 bool "tail seek support"
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24 default y
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25 depends on TAIL
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26 help
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27 This version uses lseek, which is faster on large files.
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28 */
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29
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30 #define FOR_tail
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31 #include "toys.h"
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32
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33 GLOBALS(
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34 long lines;
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35 long bytes;
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36
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37 int file_no;
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38 )
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39
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40 struct line_list {
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41 struct line_list *next, *prev;
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42 char *data;
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43 int len;
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44 };
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45
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46 static struct line_list *get_chunk(int fd, int len)
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47 {
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48 struct line_list *line = xmalloc(sizeof(struct line_list)+len);
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49
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50 memset(line, 0, sizeof(struct line_list));
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51 line->data = ((char *)line) + sizeof(struct line_list);
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52 line->len = readall(fd, line->data, len);
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53
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54 if (line->len < 1) {
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55 free(line);
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56 return 0;
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57 }
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59 return line;
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60 }
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61
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62 static void dump_chunk(void *ptr)
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63 {
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64 struct line_list *list = ptr;
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65
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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 temp->next = list;
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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) flag++;
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111
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112 // Start outputting data right after newline
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113 else if (list->data[offset] == '\n' && !++lines) {
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114 offset++;
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115 list->data += offset;
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116 list->len -= offset;
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117
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118 break;
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119 }
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120 }
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121 }
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122
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123 // Output stored data
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124 llist_traverse(list, dump_chunk);
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125
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126 // In case of -f
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127 lseek(fd, bytes, SEEK_SET);
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128 return 1;
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129 }
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130
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131 // Called for each file listed on command line, and/or stdin
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132 static void do_tail(int fd, char *name)
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133 {
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134 long bytes = TT.bytes, lines = TT.lines;
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135 int linepop = 1;
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136
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137 if (toys.optc > 1) {
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138 if (TT.file_no++) xputc('\n');
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139 xprintf("==> %s <==\n", name);
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140 }
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141
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142 // Are we measuring from the end of the file?
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143
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144 if (bytes<0 || lines<0) {
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145 struct line_list *list = 0, *new;
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146
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147 // The slow codepath is always needed, and can handle all input,
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148 // so make lseek support optional.
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149 if (CFG_TAIL_SEEK && try_lseek(fd, bytes, lines)) return;
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150
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151 // Read data until we run out, keep a trailing buffer
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152 for (;;) {
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153 // Read next page of data, appending to linked list in order
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154 if (!(new = get_chunk(fd, sizeof(toybuf)))) break;
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155 dlist_add_nomalloc((void *)&list, (void *)new);
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156
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157 // If tracing bytes, add until we have enough, discarding overflow.
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158 if (TT.bytes) {
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159 bytes += new->len;
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160 if (bytes > 0) {
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161 while (list->len <= bytes) {
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162 bytes -= list->len;
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163 free(dlist_pop(&list));
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164 }
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165 list->data += bytes;
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166 list->len -= bytes;
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167 }
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168 } else {
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169 int len = new->len, count;
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170 char *try = new->data;
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171
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172 // First character _after_ a newline starts a new line, which
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173 // works even if file doesn't end with a newline
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174 for (count=0; count<len; count++) {
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175 if (linepop) lines++;
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176 linepop = try[count] == '\n';
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177
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178 if (lines > 0) {
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179 do {
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180 if (!--(list->len)) free(dlist_pop(&list));
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181 } while (*(list->data++) != '\n');
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182 lines--;
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183 }
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184 }
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185 }
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186 }
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187
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188 // Output/free the buffer.
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189 llist_traverse(list, dump_chunk);
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190
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191 // Measuring from the beginning of the file.
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192 } else for (;;) {
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193 int len, offset = 0;
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194
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195 // Error while reading does not exit. Error writing does.
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196 len = read(fd, toybuf, sizeof(toybuf));
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197 if (len<1) break;
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198 while (bytes > 1 || lines > 1) {
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199 bytes--;
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200 if (toybuf[offset++] == '\n') lines--;
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201 if (offset >= len) break;
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parents: 674
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202 }
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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203 if (offset<len) xwrite(1, toybuf+offset, len-offset);
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
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204 }
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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205
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
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parents: 674
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206 // -f support: cache name/descriptor
494
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Timothy Elliott <tle@holymonkey.com>
parents:
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207 }
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parents:
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208
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209 void tail_main(void)
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210 {
694
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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211 // if nothing specified, default -n to -10
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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212 if (!(toys.optflags&(FLAG_n|FLAG_c))) TT.lines = -10;
494
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213
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786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
diff changeset
214 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.
Rob Landley <rob@landley.net>
parents: 504
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215
694
786841fdb1e0 Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents: 674
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216 // do -f stuff
494
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Timothy Elliott <tle@holymonkey.com>
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217 }