1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini grep implementation for busybox using libc regex.
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4 | *
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5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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6 | * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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7 | *
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8 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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9 | */
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10 | /* BB_AUDIT SUSv3 defects - unsupported option -x. */
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11 | /* BB_AUDIT GNU defects - always acts as -a. */
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12 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
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13 | /*
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14 | * 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
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15 | * correction "-e pattern1 -e pattern2" logic and more optimizations.
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16 | * precompiled regex
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17 | */
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18 | /*
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19 | * (C) 2006 Jac Goudsmit added -o option
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20 | */
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21 |
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22 | #include "libbb.h"
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23 | #include "xregex.h"
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24 |
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25 | /* options */
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26 | #define OPTSTR_GREP \
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27 | "lnqvscFiHhe:f:Lorm:" \
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28 | USE_FEATURE_GREP_CONTEXT("A:B:C:") \
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29 | USE_FEATURE_GREP_EGREP_ALIAS("E") \
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30 | USE_DESKTOP("w") \
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31 | "aI"
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32 | /* ignored: -a "assume all files to be text" */
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33 | /* ignored: -I "assume binary files have no matches" */
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34 |
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35 | enum {
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36 | OPTBIT_l, /* list matched file names only */
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37 | OPTBIT_n, /* print line# */
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38 | OPTBIT_q, /* quiet - exit(0) of first match */
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39 | OPTBIT_v, /* invert the match, to select non-matching lines */
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40 | OPTBIT_s, /* suppress errors about file open errors */
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41 | OPTBIT_c, /* count matches per file (suppresses normal output) */
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42 | OPTBIT_F, /* literal match */
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43 | OPTBIT_i, /* case-insensitive */
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44 | OPTBIT_H, /* force filename display */
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45 | OPTBIT_h, /* inhibit filename display */
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46 | OPTBIT_e, /* -e PATTERN */
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47 | OPTBIT_f, /* -f FILE_WITH_PATTERNS */
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48 | OPTBIT_L, /* list unmatched file names only */
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49 | OPTBIT_o, /* show only matching parts of lines */
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50 | OPTBIT_r, /* recurse dirs */
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51 | OPTBIT_m, /* -m MAX_MATCHES */
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52 | USE_FEATURE_GREP_CONTEXT( OPTBIT_A ,) /* -A NUM: after-match context */
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53 | USE_FEATURE_GREP_CONTEXT( OPTBIT_B ,) /* -B NUM: before-match context */
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54 | USE_FEATURE_GREP_CONTEXT( OPTBIT_C ,) /* -C NUM: -A and -B combined */
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55 | USE_FEATURE_GREP_EGREP_ALIAS(OPTBIT_E ,) /* extended regexp */
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56 | USE_DESKTOP( OPTBIT_w ,) /* whole word match */
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57 | OPT_l = 1 << OPTBIT_l,
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58 | OPT_n = 1 << OPTBIT_n,
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59 | OPT_q = 1 << OPTBIT_q,
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60 | OPT_v = 1 << OPTBIT_v,
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61 | OPT_s = 1 << OPTBIT_s,
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62 | OPT_c = 1 << OPTBIT_c,
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63 | OPT_F = 1 << OPTBIT_F,
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64 | OPT_i = 1 << OPTBIT_i,
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65 | OPT_H = 1 << OPTBIT_H,
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66 | OPT_h = 1 << OPTBIT_h,
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67 | OPT_e = 1 << OPTBIT_e,
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68 | OPT_f = 1 << OPTBIT_f,
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69 | OPT_L = 1 << OPTBIT_L,
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70 | OPT_o = 1 << OPTBIT_o,
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71 | OPT_r = 1 << OPTBIT_r,
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72 | OPT_m = 1 << OPTBIT_m,
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73 | OPT_A = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_A)) + 0,
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74 | OPT_B = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_B)) + 0,
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75 | OPT_C = USE_FEATURE_GREP_CONTEXT( (1 << OPTBIT_C)) + 0,
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76 | OPT_E = USE_FEATURE_GREP_EGREP_ALIAS((1 << OPTBIT_E)) + 0,
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77 | OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0,
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78 | };
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79 |
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80 | #define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
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81 | #define PRINT_LINE_NUM (option_mask32 & OPT_n)
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82 | #define BE_QUIET (option_mask32 & OPT_q)
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83 | #define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
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84 | #define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
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85 | #define FGREP_FLAG (option_mask32 & OPT_F)
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86 | #define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
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87 |
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88 | typedef unsigned char byte_t;
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89 |
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90 | static int max_matches;
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91 | static int reflags;
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92 | static byte_t invert_search;
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93 | static byte_t print_filename;
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94 | static byte_t open_errors;
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95 |
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96 | #if ENABLE_FEATURE_GREP_CONTEXT
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97 | static byte_t did_print_line;
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98 | static int lines_before;
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99 | static int lines_after;
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100 | static char **before_buf;
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101 | static int last_line_printed;
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102 | #endif /* ENABLE_FEATURE_GREP_CONTEXT */
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103 | /* globals used internally */
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104 | static llist_t *pattern_head; /* growable list of patterns to match */
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105 | static const char *cur_file; /* the current file we are reading */
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106 |
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107 | typedef struct grep_list_data_t {
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108 | char *pattern;
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109 | regex_t preg;
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110 | #define PATTERN_MEM_A 1
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111 | #define COMPILED 2
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112 | int flg_mem_alocated_compiled;
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113 | } grep_list_data_t;
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114 |
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115 | static void print_line(const char *line, int linenum, char decoration)
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116 | {
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117 | #if ENABLE_FEATURE_GREP_CONTEXT
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118 | /* Happens when we go to next file, immediately hit match
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119 | * and try to print prev context... from prev file! Don't do it */
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120 | if (linenum < 1)
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121 | return;
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122 | /* possibly print the little '--' separator */
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123 | if ((lines_before || lines_after) && did_print_line &&
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124 | last_line_printed != linenum - 1) {
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125 | puts("--");
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126 | }
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127 | /* guard against printing "--" before first line of first file */
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128 | did_print_line = 1;
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129 | last_line_printed = linenum;
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130 | #endif
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131 | if (print_filename)
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132 | printf("%s%c", cur_file, decoration);
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133 | if (PRINT_LINE_NUM)
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134 | printf("%i%c", linenum, decoration);
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135 | /* Emulate weird GNU grep behavior with -ov */
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136 | if ((option_mask32 & (OPT_v|OPT_o)) != (OPT_v|OPT_o))
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137 | puts(line);
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138 | }
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139 |
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140 | static int grep_file(FILE *file)
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141 | {
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142 | char *line;
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143 | byte_t ret;
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144 | int linenum = 0;
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145 | int nmatches = 0;
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146 | regmatch_t regmatch;
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147 | #if ENABLE_FEATURE_GREP_CONTEXT
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148 | int print_n_lines_after = 0;
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149 | int curpos = 0; /* track where we are in the circular 'before' buffer */
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150 | int idx = 0; /* used for iteration through the circular buffer */
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151 | #else
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152 | enum { print_n_lines_after = 0 };
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153 | #endif /* ENABLE_FEATURE_GREP_CONTEXT */
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154 |
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155 | while ((line = xmalloc_getline(file)) != NULL) {
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156 | llist_t *pattern_ptr = pattern_head;
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157 | grep_list_data_t * gl;
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158 |
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159 | linenum++;
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160 | ret = 0;
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161 | while (pattern_ptr) {
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162 | gl = (grep_list_data_t *)pattern_ptr->data;
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163 | if (FGREP_FLAG) {
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164 | ret = strstr(line, gl->pattern) != NULL;
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165 | } else {
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166 | /*
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167 | * test for a postitive-assertion match (regexec returns success (0)
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168 | * and the user did not specify invert search), or a negative-assertion
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169 | * match (regexec returns failure (REG_NOMATCH) and the user specified
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170 | * invert search)
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171 | */
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172 | if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
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173 | gl->flg_mem_alocated_compiled |= COMPILED;
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174 | xregcomp(&(gl->preg), gl->pattern, reflags);
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175 | }
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176 | regmatch.rm_so = 0;
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177 | regmatch.rm_eo = 0;
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178 | if (regexec(&(gl->preg), line, 1, ®match, 0) == 0) {
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179 | if (!(option_mask32 & OPT_w))
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180 | ret = 1;
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181 | else {
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182 | char c = ' ';
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183 | if (regmatch.rm_so)
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184 | c = line[regmatch.rm_so - 1];
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185 | if (!isalnum(c) && c != '_') {
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186 | c = line[regmatch.rm_eo];
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187 | if (!c || (!isalnum(c) && c != '_'))
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188 | ret = 1;
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189 | }
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190 | }
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191 | }
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192 | }
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193 | pattern_ptr = pattern_ptr->link;
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194 | } /* while (pattern_ptr) */
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195 |
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196 | if (ret ^ invert_search) {
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197 | /* keep track of matches */
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198 | nmatches++;
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199 |
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200 | /* quiet/print (non)matching file names only? */
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201 | if (option_mask32 & (OPT_q|OPT_l|OPT_L)) {
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202 | free(line); /* we don't need line anymore */
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203 | if (BE_QUIET) {
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204 | /* manpage says about -q:
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205 | * "exit immediately with zero status
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206 | * if any match is found,
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207 | * even if errors were detected" */
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208 | exit(0);
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209 | }
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210 | /* if we're just printing filenames, we stop after the first match */
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211 | if (PRINT_FILES_WITH_MATCHES) {
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212 | puts(cur_file);
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213 | /* fall thru to "return 1" */
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214 | }
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215 | /* OPT_L aka PRINT_FILES_WITHOUT_MATCHES: return early */
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216 | return 1; /* one match */
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217 | }
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218 |
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219 | #if ENABLE_FEATURE_GREP_CONTEXT
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220 | /* Were we printing context and saw next (unwanted) match? */
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221 | if ((option_mask32 & OPT_m) && nmatches > max_matches)
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222 | break;
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223 | #endif
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224 |
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225 | /* print the matched line */
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226 | if (PRINT_MATCH_COUNTS == 0) {
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227 | #if ENABLE_FEATURE_GREP_CONTEXT
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228 | int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
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229 |
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230 | /* if we were told to print 'before' lines and there is at least
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231 | * one line in the circular buffer, print them */
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232 | if (lines_before && before_buf[prevpos] != NULL) {
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233 | int first_buf_entry_line_num = linenum - lines_before;
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234 |
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235 | /* advance to the first entry in the circular buffer, and
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236 | * figure out the line number is of the first line in the
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237 | * buffer */
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238 | idx = curpos;
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239 | while (before_buf[idx] == NULL) {
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240 | idx = (idx + 1) % lines_before;
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241 | first_buf_entry_line_num++;
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242 | }
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243 |
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244 | /* now print each line in the buffer, clearing them as we go */
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245 | while (before_buf[idx] != NULL) {
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246 | print_line(before_buf[idx], first_buf_entry_line_num, '-');
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247 | free(before_buf[idx]);
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248 | before_buf[idx] = NULL;
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249 | idx = (idx + 1) % lines_before;
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250 | first_buf_entry_line_num++;
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251 | }
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252 | }
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253 |
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254 | /* make a note that we need to print 'after' lines */
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255 | print_n_lines_after = lines_after;
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256 | #endif
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257 | if (option_mask32 & OPT_o) {
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258 | line[regmatch.rm_eo] = '\0';
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259 | print_line(line + regmatch.rm_so, linenum, ':');
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260 | } else {
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261 | print_line(line, linenum, ':');
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262 | }
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263 | }
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264 | }
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265 | #if ENABLE_FEATURE_GREP_CONTEXT
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266 | else { /* no match */
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267 | /* if we need to print some context lines after the last match, do so */
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268 | if (print_n_lines_after) {
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269 | print_line(line, linenum, '-');
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270 | print_n_lines_after--;
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271 | } else if (lines_before) {
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272 | /* Add the line to the circular 'before' buffer */
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273 | free(before_buf[curpos]);
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274 | before_buf[curpos] = line;
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275 | curpos = (curpos + 1) % lines_before;
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276 | /* avoid free(line) - we took line */
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277 | line = NULL;
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278 | }
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279 | }
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280 |
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281 | #endif /* ENABLE_FEATURE_GREP_CONTEXT */
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282 | free(line);
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283 |
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284 | /* Did we print all context after last requested match? */
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285 | if ((option_mask32 & OPT_m)
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286 | && !print_n_lines_after && nmatches == max_matches)
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287 | break;
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288 | }
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289 |
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290 | /* special-case file post-processing for options where we don't print line
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291 | * matches, just filenames and possibly match counts */
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292 |
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293 | /* grep -c: print [filename:]count, even if count is zero */
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294 | if (PRINT_MATCH_COUNTS) {
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295 | if (print_filename)
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296 | printf("%s:", cur_file);
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297 | printf("%d\n", nmatches);
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298 | }
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299 |
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300 | /* grep -L: print just the filename */
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301 | if (PRINT_FILES_WITHOUT_MATCHES) {
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302 | /* nmatches is zero, no need to check it:
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303 | * we return 1 early if we detected a match
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304 | * and PRINT_FILES_WITHOUT_MATCHES is set */
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305 | puts(cur_file);
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306 | }
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307 |
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308 | return nmatches;
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309 | }
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310 |
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311 | #if ENABLE_FEATURE_CLEAN_UP
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312 | #define new_grep_list_data(p, m) add_grep_list_data(p, m)
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313 | static char * add_grep_list_data(char *pattern, int flg_used_mem)
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314 | #else
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315 | #define new_grep_list_data(p, m) add_grep_list_data(p)
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316 | static char * add_grep_list_data(char *pattern)
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317 | #endif
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318 | {
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319 | grep_list_data_t *gl = xmalloc(sizeof(grep_list_data_t));
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320 | gl->pattern = pattern;
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321 | #if ENABLE_FEATURE_CLEAN_UP
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322 | gl->flg_mem_alocated_compiled = flg_used_mem;
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323 | #else
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324 | gl->flg_mem_alocated_compiled = 0;
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325 | #endif
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326 | return (char *)gl;
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327 | }
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328 |
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329 | static void load_regexes_from_file(llist_t *fopt)
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330 | {
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331 | char *line;
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332 | FILE *f;
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333 |
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334 | while (fopt) {
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335 | llist_t *cur = fopt;
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336 | char *ffile = cur->data;
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337 |
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338 | fopt = cur->link;
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339 | free(cur);
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340 | f = xfopen(ffile, "r");
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341 | while ((line = xmalloc_getline(f)) != NULL) {
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342 | llist_add_to(&pattern_head,
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343 | new_grep_list_data(line, PATTERN_MEM_A));
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344 | }
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345 | }
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346 | }
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347 |
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348 | static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth)
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349 | {
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350 | FILE *file = fopen(filename, "r");
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351 | if (file == NULL) {
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352 | if (!SUPPRESS_ERR_MSGS)
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353 | bb_perror_msg("%s", cur_file);
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354 | open_errors = 1;
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355 | return 0;
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356 | }
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357 | cur_file = filename;
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358 | *(int*)matched += grep_file(file);
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359 | fclose(file);
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360 | return 1;
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361 | }
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362 |
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363 | static int grep_dir(const char *dir)
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364 | {
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365 | int matched = 0;
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366 | recursive_action(dir,
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367 | /* recurse=yes */ ACTION_RECURSE |
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368 | /* followLinks=no */
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369 | /* depthFirst=yes */ ACTION_DEPTHFIRST,
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370 | /* fileAction= */ file_action_grep,
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371 | /* dirAction= */ NULL,
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372 | /* userData= */ &matched,
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373 | /* depth= */ 0);
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374 | return matched;
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375 | }
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376 |
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377 | int grep_main(int argc, char **argv);
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378 | int grep_main(int argc, char **argv)
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379 | {
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380 | FILE *file;
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381 | int matched;
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382 | char *mopt;
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383 | llist_t *fopt = NULL;
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384 |
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385 | /* do normal option parsing */
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386 | #if ENABLE_FEATURE_GREP_CONTEXT
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387 | char *slines_after;
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388 | char *slines_before;
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389 | char *Copt;
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390 |
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391 | opt_complementary = "H-h:e::f::C-AB";
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392 | getopt32(argv,
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393 | OPTSTR_GREP,
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394 | &pattern_head, &fopt, &mopt,
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395 | &slines_after, &slines_before, &Copt);
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396 |
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397 | if (option_mask32 & OPT_C) {
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398 | /* -C unsets prev -A and -B, but following -A or -B
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399 | may override it */
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400 | if (!(option_mask32 & OPT_A)) /* not overridden */
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401 | slines_after = Copt;
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402 | if (!(option_mask32 & OPT_B)) /* not overridden */
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403 | slines_before = Copt;
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404 | option_mask32 |= OPT_A|OPT_B; /* for parser */
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405 | }
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406 | if (option_mask32 & OPT_A) {
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407 | lines_after = xatoi_u(slines_after);
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408 | }
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409 | if (option_mask32 & OPT_B) {
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410 | lines_before = xatoi_u(slines_before);
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411 | }
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412 | /* sanity checks */
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413 | if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
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414 | option_mask32 &= ~OPT_n;
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415 | lines_before = 0;
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416 | lines_after = 0;
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417 | } else if (lines_before > 0)
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418 | before_buf = xzalloc(lines_before * sizeof(char *));
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419 | #else
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420 | /* with auto sanity checks */
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421 | opt_complementary = "H-h:e::f::c-n:q-n:l-n";
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422 | getopt32(argv, OPTSTR_GREP,
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423 | &pattern_head, &fopt, &mopt);
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424 | #endif
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425 | if (option_mask32 & OPT_m) {
|
---|
426 | max_matches = xatoi_u(mopt);
|
---|
427 | }
|
---|
428 | invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
|
---|
429 |
|
---|
430 | if (pattern_head != NULL) {
|
---|
431 | /* convert char **argv to grep_list_data_t */
|
---|
432 | llist_t *cur;
|
---|
433 |
|
---|
434 | for (cur = pattern_head; cur; cur = cur->link)
|
---|
435 | cur->data = new_grep_list_data(cur->data, 0);
|
---|
436 | }
|
---|
437 | if (option_mask32 & OPT_f)
|
---|
438 | load_regexes_from_file(fopt);
|
---|
439 |
|
---|
440 | if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
|
---|
441 | option_mask32 |= OPT_F;
|
---|
442 |
|
---|
443 | if (!(option_mask32 & (OPT_o | OPT_w)))
|
---|
444 | reflags = REG_NOSUB;
|
---|
445 |
|
---|
446 | if (ENABLE_FEATURE_GREP_EGREP_ALIAS &&
|
---|
447 | (applet_name[0] == 'e' || (option_mask32 & OPT_E)))
|
---|
448 | reflags |= REG_EXTENDED;
|
---|
449 |
|
---|
450 | if (option_mask32 & OPT_i)
|
---|
451 | reflags |= REG_ICASE;
|
---|
452 |
|
---|
453 | argv += optind;
|
---|
454 | argc -= optind;
|
---|
455 |
|
---|
456 | /* if we didn't get a pattern from a -e and no command file was specified,
|
---|
457 | * argv[optind] should be the pattern. no pattern, no worky */
|
---|
458 | if (pattern_head == NULL) {
|
---|
459 | char *pattern;
|
---|
460 | if (*argv == NULL)
|
---|
461 | bb_show_usage();
|
---|
462 | pattern = new_grep_list_data(*argv++, 0);
|
---|
463 | llist_add_to(&pattern_head, pattern);
|
---|
464 | argc--;
|
---|
465 | }
|
---|
466 |
|
---|
467 | /* argv[(optind)..(argc-1)] should be names of file to grep through. If
|
---|
468 | * there is more than one file to grep, we will print the filenames. */
|
---|
469 | if (argc > 1)
|
---|
470 | print_filename = 1;
|
---|
471 | /* -H / -h of course override */
|
---|
472 | if (option_mask32 & OPT_H)
|
---|
473 | print_filename = 1;
|
---|
474 | if (option_mask32 & OPT_h)
|
---|
475 | print_filename = 0;
|
---|
476 |
|
---|
477 | /* If no files were specified, or '-' was specified, take input from
|
---|
478 | * stdin. Otherwise, we grep through all the files specified. */
|
---|
479 | if (argc == 0)
|
---|
480 | argc++;
|
---|
481 | matched = 0;
|
---|
482 | while (argc--) {
|
---|
483 | cur_file = *argv++;
|
---|
484 | file = stdin;
|
---|
485 | if (!cur_file || (*cur_file == '-' && !cur_file[1])) {
|
---|
486 | cur_file = "(standard input)";
|
---|
487 | } else {
|
---|
488 | if (option_mask32 & OPT_r) {
|
---|
489 | struct stat st;
|
---|
490 | if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
|
---|
491 | if (!(option_mask32 & OPT_h))
|
---|
492 | print_filename = 1;
|
---|
493 | matched += grep_dir(cur_file);
|
---|
494 | goto grep_done;
|
---|
495 | }
|
---|
496 | }
|
---|
497 | /* else: fopen(dir) will succeed, but reading won't */
|
---|
498 | file = fopen(cur_file, "r");
|
---|
499 | if (file == NULL) {
|
---|
500 | if (!SUPPRESS_ERR_MSGS)
|
---|
501 | bb_perror_msg("%s", cur_file);
|
---|
502 | open_errors = 1;
|
---|
503 | continue;
|
---|
504 | }
|
---|
505 | }
|
---|
506 | matched += grep_file(file);
|
---|
507 | fclose_if_not_stdin(file);
|
---|
508 | grep_done: ;
|
---|
509 | }
|
---|
510 |
|
---|
511 | /* destroy all the elments in the pattern list */
|
---|
512 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
513 | while (pattern_head) {
|
---|
514 | llist_t *pattern_head_ptr = pattern_head;
|
---|
515 | grep_list_data_t *gl =
|
---|
516 | (grep_list_data_t *)pattern_head_ptr->data;
|
---|
517 |
|
---|
518 | pattern_head = pattern_head->link;
|
---|
519 | if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
|
---|
520 | free(gl->pattern);
|
---|
521 | if ((gl->flg_mem_alocated_compiled & COMPILED))
|
---|
522 | regfree(&(gl->preg));
|
---|
523 | free(gl);
|
---|
524 | free(pattern_head_ptr);
|
---|
525 | }
|
---|
526 | }
|
---|
527 | /* 0 = success, 1 = failed, 2 = error */
|
---|
528 | if (open_errors)
|
---|
529 | return 2;
|
---|
530 | return !matched; /* invert return value 0 = success, 1 = failed */
|
---|
531 | }
|
---|