annotate toys/posix/sed.c @ 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. The actual code should be the same afterward, this is just cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Tue, 13 Nov 2012 17:14:08 -0600
parents 7e846e281e38
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
1 /* sed.c - Stream editor.
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 *
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6df4ccc0acbe Regularize command headers, update links to standards documents.
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/sed.c
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6
234
163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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7 USE_SED(NEWTOY(sed, "irne*", TOYFLAG_BIN))
163498bf547b Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
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8
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9 config SED
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parents: 674
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10 bool "sed"
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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11 default n
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12 help
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13 usage: sed [-irn] {command | [-e command]...} [FILE...]
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14
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15 Stream EDitor, transforms text by appling script of command to each line
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16 of input.
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17
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18 -e Add expression to the command script (if no -e, use first argument)
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19 -i Modify file in place
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20 -n No default output (p commands only)
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21 -r Use extended regular expression syntex
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22 */
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23
674
7e846e281e38 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.
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24 #define FOR_sed
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25 #include "toys.h"
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26 #include "lib/xregcomp.h"
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27
674
7e846e281e38 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.
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28 GLOBALS(
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29 struct arg_list *scripts;
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30 struct double_list *commands;
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31
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32 void *parsed;
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33 )
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34
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35 // Digested version of what sed commands can actually tell use to do.
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36
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37
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38 struct sed_command {
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39 // double_list compatibility (easier to create in-order)
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40 struct sed_command *next, *prev;
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41
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42 // data string for (saicytb)
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43 char c, *data;
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44 // Regexes for s/match/data/ and /begin/,/end/command
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45 regex_t *match, *begin, *end;
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46 // For numeric ranges ala 10,20command
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47 long lstart, lstop;
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48 // Which match to replace, 0 for all. s and w commands can write to a file
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49 int which, outfd;
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50 };
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51
694
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52 // Space. Space. Gotta get past space. Spaaaaaaaace! (But not newline.)
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53 void spaceorb(char **s)
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54 {
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55 while (**s == ' ' || **s == '\t') *s++;
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56 }
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57
694
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58 void parse_scripts(void)
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parents: 674
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59 {
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60 struct sed_command *commands = 0;
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61 struct arg_list *script;
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62 int which = 0;
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63 long l;
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64
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65 for (script = TT.scripts; *script; script = script->next) {
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66 char *str = script->arg, *s;
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67 struct sed_command *cmd;
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68
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69 which++;
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70 for (i=1;;) {
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71 if (!*str) break;
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72
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73 cmd = xzalloc(sizeof(struct sed_command));
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31dc682c18ad Very early stub of sed, does nothing yet.
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74
694
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75 // Identify prefix
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76 for (;;) {
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77 long l;
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78
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diff changeset
79 spaceorb(&str);
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80 if (*str == '$') {
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81 l = -1;
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82 str++;
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83 } else if (isdigit(*str)) l = strtol(str, &str, 10);
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84 else if (!cmd->lstart) break;
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85 else goto parse_fail;
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86
694
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87 spaceorb(&str);
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88 if (!cmd->lstart) {
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89 if (!l) goto parse_fail;
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90 cmd->lstart = l;
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91 if (*str != ',') break;
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92 str++;
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93 continue;
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94 }
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95 cmd->lstop = l;
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96 break;
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97 } else if (*str == '/') {
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98 printf("regex\n");
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99 }
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100 l = stridx("{bcdDgGhHlnNpPstwxyrqia= \t#:}", *str);
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101 if (l == -1) goto parse_fail;
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102
694
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103
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104 }
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105 }
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106
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107 return;
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108
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109 parse_fail:
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110 error_exit("bad expression %d@%d: %s", which, i, script->arg+i);
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111 }
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112
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113 void sed_main(void)
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114 {
694
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115 char **files=toys.optargs;
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116
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117 // If no -e, use first argument
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118 if (!TT.scripts) {
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119 if (!*files) error_exit("Need script");
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120 (TT.scripts=xzalloc(sizeof(struct arg_list)))->arg=*(files++);
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121 }
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122
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123
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124 {
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125 struct arg_list *test;
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126
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127 for (test = TT.commands; test; test = test->next)
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128 dprintf(2,"command=%s\n",test->arg);
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129 while (*files) dprintf(2,"file=%s\n", *(files++));
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130 }
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131 }