1 | /*- |
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2 | * Copyright (c) 1992, 1993, 1994 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * Copyright (c) 1992, 1993, 1994, 1995, 1996 |
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5 | * Keith Bostic. All rights reserved. |
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6 | * |
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7 | * See the LICENSE file for redistribution information. |
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8 | */ |
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9 | |
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10 | #include "config.h" |
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11 | |
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12 | #ifndef lint |
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13 | static const char sccsid[] = "@(#)search.c 10.25 (Berkeley) 6/30/96"; |
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14 | #endif /* not lint */ |
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15 | |
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16 | #include <sys/types.h> |
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17 | #include <sys/queue.h> |
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18 | |
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19 | #include <bitstring.h> |
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20 | #include <ctype.h> |
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21 | #include <errno.h> |
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22 | #include <limits.h> |
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23 | #include <stdio.h> |
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24 | #include <stdlib.h> |
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25 | #include <string.h> |
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26 | #include <unistd.h> |
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27 | |
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28 | #include "common.h" |
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29 | |
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30 | typedef enum { S_EMPTY, S_EOF, S_NOPREV, S_NOTFOUND, S_SOF, S_WRAP } smsg_t; |
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31 | |
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32 | static void search_msg __P((SCR *, smsg_t)); |
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33 | static int search_init __P((SCR *, dir_t, char *, size_t, char **, u_int)); |
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34 | |
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35 | /* |
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36 | * search_init -- |
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37 | * Set up a search. |
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38 | */ |
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39 | static int |
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40 | search_init(sp, dir, ptrn, plen, epp, flags) |
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41 | SCR *sp; |
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42 | dir_t dir; |
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43 | char *ptrn, **epp; |
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44 | size_t plen; |
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45 | u_int flags; |
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46 | { |
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47 | recno_t lno; |
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48 | int delim; |
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49 | char *p, *t; |
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50 | |
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51 | /* If the file is empty, it's a fast search. */ |
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52 | if (sp->lno <= 1) { |
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53 | if (db_last(sp, &lno)) |
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54 | return (1); |
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55 | if (lno == 0) { |
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56 | if (LF_ISSET(SEARCH_MSG)) |
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57 | search_msg(sp, S_EMPTY); |
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58 | return (1); |
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59 | } |
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60 | } |
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61 | |
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62 | if (LF_ISSET(SEARCH_PARSE)) { /* Parse the string. */ |
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63 | /* |
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64 | * Use the saved pattern if no pattern specified, or if only |
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65 | * one or two delimiter characters specified. |
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66 | * |
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67 | * !!! |
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68 | * Historically, only the pattern itself was saved, vi didn't |
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69 | * preserve addressing or delta information. |
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70 | */ |
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71 | if (ptrn == NULL) |
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72 | goto prev; |
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73 | if (plen == 1) { |
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74 | if (epp != NULL) |
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75 | *epp = ptrn + 1; |
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76 | goto prev; |
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77 | } |
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78 | if (ptrn[0] == ptrn[1]) { |
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79 | if (epp != NULL) |
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80 | *epp = ptrn + 2; |
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81 | |
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82 | /* Complain if we don't have a previous pattern. */ |
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83 | prev: if (sp->re == NULL) { |
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84 | search_msg(sp, S_NOPREV); |
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85 | return (1); |
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86 | } |
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87 | /* Re-compile the search pattern if necessary. */ |
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88 | if (!F_ISSET(sp, SC_RE_SEARCH) && re_compile(sp, |
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89 | sp->re, sp->re_len, NULL, NULL, &sp->re_c, |
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90 | RE_C_SEARCH | |
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91 | (LF_ISSET(SEARCH_MSG) ? 0 : RE_C_SILENT))) |
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92 | return (1); |
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93 | |
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94 | /* Set the search direction. */ |
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95 | if (LF_ISSET(SEARCH_SET)) |
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96 | sp->searchdir = dir; |
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97 | return (0); |
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98 | } |
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99 | |
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100 | /* |
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101 | * Set the delimiter, and move forward to the terminating |
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102 | * delimiter, handling escaped delimiters. |
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103 | * |
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104 | * QUOTING NOTE: |
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105 | * Only discard an escape character if it escapes a delimiter. |
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106 | */ |
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107 | for (delim = *ptrn, p = t = ++ptrn;; *t++ = *p++) { |
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108 | if (--plen == 0 || p[0] == delim) { |
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109 | if (plen != 0) |
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110 | ++p; |
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111 | break; |
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112 | } |
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113 | if (plen > 1 && p[0] == '\\' && p[1] == delim) { |
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114 | ++p; |
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115 | --plen; |
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116 | } |
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117 | } |
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118 | if (epp != NULL) |
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119 | *epp = p; |
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120 | |
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121 | plen = t - ptrn; |
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122 | } |
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123 | |
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124 | /* Compile the RE. */ |
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125 | if (re_compile(sp, ptrn, plen, &sp->re, &sp->re_len, &sp->re_c, |
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126 | RE_C_SEARCH | |
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127 | (LF_ISSET(SEARCH_MSG) ? 0 : RE_C_SILENT) | |
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128 | (LF_ISSET(SEARCH_TAG) ? RE_C_TAG : 0) | |
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129 | (LF_ISSET(SEARCH_CSCOPE) ? RE_C_CSCOPE : 0))) |
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130 | return (1); |
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131 | |
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132 | /* Set the search direction. */ |
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133 | if (LF_ISSET(SEARCH_SET)) |
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134 | sp->searchdir = dir; |
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135 | |
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136 | return (0); |
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137 | } |
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138 | |
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139 | /* |
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140 | * f_search -- |
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141 | * Do a forward search. |
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142 | * |
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143 | * PUBLIC: int f_search __P((SCR *, |
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144 | * PUBLIC: MARK *, MARK *, char *, size_t, char **, u_int)); |
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145 | */ |
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146 | int |
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147 | f_search(sp, fm, rm, ptrn, plen, eptrn, flags) |
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148 | SCR *sp; |
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149 | MARK *fm, *rm; |
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150 | char *ptrn, **eptrn; |
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151 | size_t plen; |
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152 | u_int flags; |
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153 | { |
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154 | busy_t btype; |
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155 | recno_t lno; |
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156 | regmatch_t match[1]; |
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157 | size_t coff, len; |
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158 | int cnt, eval, rval, wrapped; |
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159 | char *l; |
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160 | |
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161 | if (search_init(sp, FORWARD, ptrn, plen, eptrn, flags)) |
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162 | return (1); |
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163 | |
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164 | if (LF_ISSET(SEARCH_FILE)) { |
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165 | lno = 1; |
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166 | coff = 0; |
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167 | } else { |
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168 | if (db_get(sp, fm->lno, DBG_FATAL, &l, &len)) |
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169 | return (1); |
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170 | lno = fm->lno; |
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171 | |
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172 | /* |
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173 | * If doing incremental search, start searching at the previous |
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174 | * column, so that we search a minimal distance and still match |
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175 | * special patterns, e.g., \< for beginning of a word. |
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176 | * |
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177 | * Otherwise, start searching immediately after the cursor. If |
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178 | * at the end of the line, start searching on the next line. |
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179 | * This is incompatible (read bug fix) with the historic vi -- |
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180 | * searches for the '$' pattern never moved forward, and the |
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181 | * "-t foo" didn't work if the 'f' was the first character in |
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182 | * the file. |
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183 | */ |
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184 | if (LF_ISSET(SEARCH_INCR)) { |
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185 | if ((coff = fm->cno) != 0) |
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186 | --coff; |
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187 | } else if (fm->cno + 1 >= len) { |
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188 | coff = 0; |
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189 | lno = fm->lno + 1; |
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190 | if (db_get(sp, lno, 0, &l, &len)) { |
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191 | if (!O_ISSET(sp, O_WRAPSCAN)) { |
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192 | if (LF_ISSET(SEARCH_MSG)) |
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193 | search_msg(sp, S_EOF); |
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194 | return (1); |
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195 | } |
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196 | lno = 1; |
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197 | } |
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198 | } else |
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199 | coff = fm->cno + 1; |
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200 | } |
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201 | |
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202 | btype = BUSY_ON; |
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203 | for (cnt = INTERRUPT_CHECK, rval = 1, wrapped = 0;; ++lno, coff = 0) { |
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204 | if (cnt-- == 0) { |
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205 | if (INTERRUPTED(sp)) |
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206 | break; |
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207 | if (LF_ISSET(SEARCH_MSG)) { |
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208 | search_busy(sp, btype); |
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209 | btype = BUSY_UPDATE; |
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210 | } |
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211 | cnt = INTERRUPT_CHECK; |
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212 | } |
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213 | if (wrapped && lno > fm->lno || db_get(sp, lno, 0, &l, &len)) { |
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214 | if (wrapped) { |
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215 | if (LF_ISSET(SEARCH_MSG)) |
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216 | search_msg(sp, S_NOTFOUND); |
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217 | break; |
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218 | } |
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219 | if (!O_ISSET(sp, O_WRAPSCAN)) { |
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220 | if (LF_ISSET(SEARCH_MSG)) |
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221 | search_msg(sp, S_EOF); |
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222 | break; |
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223 | } |
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224 | lno = 0; |
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225 | wrapped = 1; |
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226 | continue; |
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227 | } |
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228 | |
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229 | /* If already at EOL, just keep going. */ |
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230 | if (len != 0 && coff == len) |
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231 | continue; |
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232 | |
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233 | /* Set the termination. */ |
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234 | match[0].rm_so = coff; |
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235 | match[0].rm_eo = len; |
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236 | |
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237 | #if defined(DEBUG) && 0 |
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238 | TRACE(sp, "F search: %lu from %u to %u\n", |
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239 | lno, coff, len != 0 ? len - 1 : len); |
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240 | #endif |
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241 | /* Search the line. */ |
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242 | eval = regexec(&sp->re_c, l, 1, match, |
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243 | (match[0].rm_so == 0 ? 0 : REG_NOTBOL) | REG_STARTEND); |
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244 | if (eval == REG_NOMATCH) |
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245 | continue; |
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246 | if (eval != 0) { |
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247 | if (LF_ISSET(SEARCH_MSG)) |
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248 | re_error(sp, eval, &sp->re_c); |
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249 | else |
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250 | (void)sp->gp->scr_bell(sp); |
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251 | break; |
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252 | } |
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253 | |
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254 | /* Warn if the search wrapped. */ |
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255 | if (wrapped && LF_ISSET(SEARCH_WMSG)) |
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256 | search_msg(sp, S_WRAP); |
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257 | |
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258 | #if defined(DEBUG) && 0 |
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259 | TRACE(sp, "F search: %qu to %qu\n", |
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260 | match[0].rm_so, match[0].rm_eo); |
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261 | #endif |
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262 | rm->lno = lno; |
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263 | rm->cno = match[0].rm_so; |
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264 | |
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265 | /* |
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266 | * If a change command, it's possible to move beyond the end |
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267 | * of a line. Historic vi generally got this wrong (e.g. try |
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268 | * "c?$<cr>"). Not all that sure this gets it right, there |
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269 | * are lots of strange cases. |
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270 | */ |
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271 | if (!LF_ISSET(SEARCH_EOL) && rm->cno >= len) |
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272 | rm->cno = len != 0 ? len - 1 : 0; |
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273 | |
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274 | rval = 0; |
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275 | break; |
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276 | } |
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277 | |
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278 | if (LF_ISSET(SEARCH_MSG)) |
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279 | search_busy(sp, BUSY_OFF); |
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280 | return (rval); |
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281 | } |
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282 | |
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283 | /* |
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284 | * b_search -- |
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285 | * Do a backward search. |
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286 | * |
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287 | * PUBLIC: int b_search __P((SCR *, |
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288 | * PUBLIC: MARK *, MARK *, char *, size_t, char **, u_int)); |
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289 | */ |
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290 | int |
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291 | b_search(sp, fm, rm, ptrn, plen, eptrn, flags) |
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292 | SCR *sp; |
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293 | MARK *fm, *rm; |
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294 | char *ptrn, **eptrn; |
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295 | size_t plen; |
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296 | u_int flags; |
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297 | { |
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298 | busy_t btype; |
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299 | recno_t lno; |
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300 | regmatch_t match[1]; |
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301 | size_t coff, last, len; |
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302 | int cnt, eval, rval, wrapped; |
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303 | char *l; |
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304 | |
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305 | if (search_init(sp, BACKWARD, ptrn, plen, eptrn, flags)) |
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306 | return (1); |
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307 | |
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308 | /* |
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309 | * If doing incremental search, set the "starting" position past the |
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310 | * current column, so that we search a minimal distance and still |
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311 | * match special patterns, e.g., \> for the end of a word. This is |
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312 | * safe when the cursor is at the end of a line because we only use |
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313 | * it for comparison with the location of the match. |
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314 | * |
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315 | * Otherwise, start searching immediately before the cursor. If in |
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316 | * the first column, start search on the previous line. |
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317 | */ |
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318 | if (LF_ISSET(SEARCH_INCR)) { |
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319 | lno = fm->lno; |
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320 | coff = fm->cno + 1; |
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321 | } else { |
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322 | if (fm->cno == 0) { |
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323 | if (fm->lno == 1 && !O_ISSET(sp, O_WRAPSCAN)) { |
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324 | if (LF_ISSET(SEARCH_MSG)) |
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325 | search_msg(sp, S_SOF); |
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326 | return (1); |
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327 | } |
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328 | lno = fm->lno - 1; |
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329 | } else |
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330 | lno = fm->lno; |
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331 | coff = fm->cno; |
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332 | } |
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333 | |
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334 | btype = BUSY_ON; |
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335 | for (cnt = INTERRUPT_CHECK, rval = 1, wrapped = 0;; --lno, coff = 0) { |
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336 | if (cnt-- == 0) { |
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337 | if (INTERRUPTED(sp)) |
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338 | break; |
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339 | if (LF_ISSET(SEARCH_MSG)) { |
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340 | search_busy(sp, btype); |
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341 | btype = BUSY_UPDATE; |
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342 | } |
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343 | cnt = INTERRUPT_CHECK; |
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344 | } |
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345 | if (wrapped && lno < fm->lno || lno == 0) { |
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346 | if (wrapped) { |
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347 | if (LF_ISSET(SEARCH_MSG)) |
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348 | search_msg(sp, S_NOTFOUND); |
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349 | break; |
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350 | } |
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351 | if (!O_ISSET(sp, O_WRAPSCAN)) { |
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352 | if (LF_ISSET(SEARCH_MSG)) |
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353 | search_msg(sp, S_SOF); |
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354 | break; |
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355 | } |
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356 | if (db_last(sp, &lno)) |
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357 | break; |
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358 | if (lno == 0) { |
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359 | if (LF_ISSET(SEARCH_MSG)) |
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360 | search_msg(sp, S_EMPTY); |
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361 | break; |
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362 | } |
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363 | ++lno; |
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364 | wrapped = 1; |
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365 | continue; |
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366 | } |
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367 | |
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368 | if (db_get(sp, lno, 0, &l, &len)) |
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369 | break; |
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370 | |
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371 | /* Set the termination. */ |
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372 | match[0].rm_so = 0; |
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373 | match[0].rm_eo = len; |
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374 | |
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375 | #if defined(DEBUG) && 0 |
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376 | TRACE(sp, "B search: %lu from 0 to %qu\n", lno, match[0].rm_eo); |
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377 | #endif |
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378 | /* Search the line. */ |
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379 | eval = regexec(&sp->re_c, l, 1, match, |
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380 | (match[0].rm_eo == len ? 0 : REG_NOTEOL) | REG_STARTEND); |
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381 | if (eval == REG_NOMATCH) |
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382 | continue; |
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383 | if (eval != 0) { |
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384 | if (LF_ISSET(SEARCH_MSG)) |
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385 | re_error(sp, eval, &sp->re_c); |
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386 | else |
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387 | (void)sp->gp->scr_bell(sp); |
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388 | break; |
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389 | } |
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390 | |
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391 | /* Check for a match starting past the cursor. */ |
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392 | if (coff != 0 && match[0].rm_so >= coff) |
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393 | continue; |
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394 | |
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395 | /* Warn if the search wrapped. */ |
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396 | if (wrapped && LF_ISSET(SEARCH_WMSG)) |
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397 | search_msg(sp, S_WRAP); |
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398 | |
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399 | #if defined(DEBUG) && 0 |
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400 | TRACE(sp, "B found: %qu to %qu\n", |
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401 | match[0].rm_so, match[0].rm_eo); |
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402 | #endif |
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403 | /* |
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404 | * We now have the first match on the line. Step through the |
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405 | * line character by character until find the last acceptable |
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406 | * match. This is painful, we need a better interface to regex |
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407 | * to make this work. |
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408 | */ |
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409 | for (;;) { |
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410 | last = match[0].rm_so++; |
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411 | if (match[0].rm_so >= len) |
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412 | break; |
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413 | match[0].rm_eo = len; |
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414 | eval = regexec(&sp->re_c, l, 1, match, |
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415 | (match[0].rm_so == 0 ? 0 : REG_NOTBOL) | |
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416 | REG_STARTEND); |
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417 | if (eval == REG_NOMATCH) |
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418 | break; |
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419 | if (eval != 0) { |
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420 | if (LF_ISSET(SEARCH_MSG)) |
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421 | re_error(sp, eval, &sp->re_c); |
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422 | else |
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423 | (void)sp->gp->scr_bell(sp); |
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424 | goto err; |
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425 | } |
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426 | if (coff && match[0].rm_so >= coff) |
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427 | break; |
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428 | } |
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429 | rm->lno = lno; |
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430 | |
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431 | /* See comment in f_search(). */ |
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432 | if (!LF_ISSET(SEARCH_EOL) && last >= len) |
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433 | rm->cno = len != 0 ? len - 1 : 0; |
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434 | else |
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435 | rm->cno = last; |
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436 | rval = 0; |
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437 | break; |
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438 | } |
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439 | |
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440 | err: if (LF_ISSET(SEARCH_MSG)) |
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441 | search_busy(sp, BUSY_OFF); |
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442 | return (rval); |
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443 | } |
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444 | |
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445 | /* |
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446 | * search_msg -- |
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447 | * Display one of the search messages. |
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448 | */ |
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449 | static void |
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450 | search_msg(sp, msg) |
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451 | SCR *sp; |
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452 | smsg_t msg; |
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453 | { |
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454 | switch (msg) { |
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455 | case S_EMPTY: |
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456 | msgq(sp, M_ERR, "072|File empty; nothing to search"); |
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457 | break; |
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458 | case S_EOF: |
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459 | msgq(sp, M_ERR, |
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460 | "073|Reached end-of-file without finding the pattern"); |
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461 | break; |
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462 | case S_NOPREV: |
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463 | msgq(sp, M_ERR, "074|No previous search pattern"); |
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464 | break; |
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465 | case S_NOTFOUND: |
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466 | msgq(sp, M_ERR, "075|Pattern not found"); |
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467 | break; |
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468 | case S_SOF: |
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469 | msgq(sp, M_ERR, |
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470 | "076|Reached top-of-file without finding the pattern"); |
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471 | break; |
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472 | case S_WRAP: |
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473 | msgq(sp, M_ERR, "077|Search wrapped"); |
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474 | break; |
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475 | default: |
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476 | abort(); |
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477 | } |
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478 | } |
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479 | |
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480 | /* |
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481 | * search_busy -- |
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482 | * Put up the busy searching message. |
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483 | * |
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484 | * PUBLIC: void search_busy __P((SCR *, busy_t)); |
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485 | */ |
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486 | void |
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487 | search_busy(sp, btype) |
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488 | SCR *sp; |
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489 | busy_t btype; |
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490 | { |
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491 | sp->gp->scr_busy(sp, "078|Searching...", btype); |
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492 | } |
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