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annotate toys/posix/expand.c @ 715:3417db95f24b

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Add expand command as described in POSIX-2008. Erratum: Do not handle backspace.
author Jonathan Clairembault <jonathan@clairembault.fr>
date Fri, 23 Nov 2012 00:06:28 +0100
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children 8c10cf7bace0
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1 /* expand.c - expands tabs to space
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2 *
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3 * FIXME: handle backspace.
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4 *
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5 * Copyright 2012 Jonathan Clairembault <jonathan at clairembault dot fr>
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6 *
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7 * See http://http://pubs.opengroup.org/onlinepubs/9699919799/nframe.html
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8
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9 USE_EXPAND(NEWTOY(expand, "t:", TOYFLAG_USR|TOYFLAG_BIN))
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10
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11 config EXPAND
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12 bool "expand"
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13 default n
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14 help
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15 usage: expand [-t tablist] [file...]
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16
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17 Command expand. Expands tabs to space according to tabstops.
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18
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19 -t tablist
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20 Specify the tab stops. The argument tablist consists of either a single
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21 strictly positive decimal integer or a list of tabstops. If a single number
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22 is given, tabs are set that number of column positions apart instead of the
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23 default 8.
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24
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25 If a list of tabstops is given, the list is made of two or more strictly
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26 positive decimal integers, separated by <blank> or <comma> characters, in
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27 strictly ascending order. The <tab> characters are set at those specific
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28 column positions.
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29
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30 In the event of expand having to process a <tab> at a position beyond the
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31 last of those specified in a multiple tab-stop list, the <tab> is replaced
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32 by a single <space> in the output.
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33
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34 Any <backspace> characters shall be copied to the output and cause the
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35 column position count for tab stop calculations to be decremented; the
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36 column position count shall not be decremented below zero.
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37 */
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38
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39 #define FOR_expand
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40 #include "toys.h"
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41
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42 GLOBALS(
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43 char *t_flags;
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44 struct offset_list tablist;
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45 )
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46
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47 static void build_tablist(char *tabstops)
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48 {
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49 char *ctx;
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50 struct offset_list *tablist = &TT.tablist;
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51 char *s, *ref;
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52 off_t stop, last_stop;
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53
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54 /* for every tabstop decode and add to list */
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55 for (stop = last_stop = 0, s = ref = xstrdup(tabstops); ;
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56 last_stop = stop, s = NULL) {
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57 char *tabstop = strtok_r(s, " ,", &ctx);
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58
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59 if (!tabstop) return;
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60
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61 stop = xstrtoul(tabstop, NULL, 0);
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62 if (stop <= last_stop) {
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63 free(ref);
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64 toys.exithelp = 1;
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65 error_exit("tablist ascending order");
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66 }
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67 tablist->next = xzalloc(sizeof(*tablist));
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68 tablist->next->off = stop;
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69 tablist = tablist->next;
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70 }
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71
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72 free(ref);
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73 }
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74
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75 static void expand_file(int fd, char *name)
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76 {
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77 ssize_t rdn;
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78 char *rdbuf, *wrbuf;
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79 size_t wrbuflen, rdbuflen;
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80 ssize_t rdbufi = 0, wrbufi = 0;
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81 ssize_t wrlinei;
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82 int hastablist = !!TT.tablist.next->next;
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83 struct offset_list *tablist = TT.tablist.next;
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84 ssize_t stop = tablist->off;
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85
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86 wrbuflen = rdbuflen = ARRAY_LEN(toybuf)/2;
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87 rdbuf = toybuf;
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88 wrbuf = toybuf + rdbuflen;
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89 do {
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90 rdn = readall(fd, rdbuf, rdbuflen);
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91 if (rdn < 0) perror_exit("%s", name);
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92 for (rdbufi=0, wrbufi=0; rdbufi<rdn; rdbufi++) {
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93 if (wrbufi == wrbuflen) { /* flush expand buffer when full */
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94 writeall(STDOUT_FILENO, wrbuf, wrbuflen);
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95 wrbufi = 0;
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96 }
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97 if (rdbuf[rdbufi] == '\t') { /* expand tab */
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98 size_t count;
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99 size_t tabsize;
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100
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101 /* search next tab stop */
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102 while(tablist && (stop <= wrlinei)) {
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103 stop = hastablist ? tablist->off : stop + tablist->off;
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104 tablist = hastablist ? tablist->next : tablist;
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105 }
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106 tabsize = ((stop - wrlinei < 2)) ? 1 : stop - wrlinei;
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107 while (tabsize) { /* long expand */
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108 count = min(tabsize, wrbuflen - wrbufi);
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109 memset(wrbuf + wrbufi, ' ', count);
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110 tabsize -= count;
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111 if (tabsize) { /* flush expand buffer when full */
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112 writeall(STDOUT_FILENO, wrbuf, wrbuflen);
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113 wrbufi = 0;
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114 } else wrbufi += count;
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115 }
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116 wrlinei += count;
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117 } else { /* copy input to output */
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118 wrbuf[wrbufi++] = rdbuf[rdbufi];
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119 wrlinei += 1;
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120 /* flush expand buffer and reset tablist at newline */
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121 if (rdbuf[rdbufi] == '\n') {
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122 writeall(STDOUT_FILENO, wrbuf, wrbufi);
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123 tablist = TT.tablist.next;
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124 stop = tablist->off;
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125 wrbufi = wrlinei = 0;
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126 }
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127 }
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128 }
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129 } while (rdn == rdbuflen);
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130 /* flush last expand buffer */
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131 writeall(STDOUT_FILENO, wrbuf, wrbufi);
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132 }
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133
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134 void expand_main(void)
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135 {
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136 build_tablist((toys.optflags & FLAG_t) ? TT.t_flags : "8");
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137 /* expand every file */
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138 loopfiles(toys.optargs, expand_file);
3417db95f24b Add expand command as described in POSIX-2008.
Jonathan Clairembault <jonathan@clairembault.fr>
parents:
diff changeset
139 /* free tablist */
3417db95f24b Add expand command as described in POSIX-2008.
Jonathan Clairembault <jonathan@clairembault.fr>
parents:
diff changeset
140 llist_traverse(TT.tablist.next, free);
3417db95f24b Add expand command as described in POSIX-2008.
Jonathan Clairembault <jonathan@clairembault.fr>
parents:
diff changeset
141 }