vi/v_search.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: v_search.c,v 8.15 1993/11/18 10:09:27 bostic Exp $ (Berkeley) $Date: 1993/11/18 10:09:27 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include <errno.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 #include "vi.h"
  19 #include "vcmd.h"
  20
  21 static int bcorrect __P((SCR *, EXF *, VICMDARG *, MARK *, MARK *, u_int));
  22 static int fcorrect __P((SCR *, EXF *, VICMDARG *, MARK *, MARK *, u_int));
  23 static int getptrn __P((SCR *, EXF *, int, char **));
  24
  25 /*
  26  * v_searchn -- n
  27  *      Repeat last search.
  28  */
  29 int
  30 v_searchn(sp, ep, vp, fm, tm, rp)
  31         SCR *sp;
  32         EXF *ep;
  33         VICMDARG *vp;
  34         MARK *fm, *tm, *rp;
  35 {
  36         int flags;
  37
  38         flags = SEARCH_MSG;
  39         if (F_ISSET(vp, VC_C | VC_D | VC_Y))
  40                 flags |= SEARCH_EOL;
  41         switch (sp->searchdir) {
  42         case BACKWARD:
  43                 if (b_search(sp, ep, fm, rp, NULL, NULL, &flags))
  44                         return (1);
  45                 if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
  46                     bcorrect(sp, ep, vp, fm, rp, flags))
  47                         return (1);
  48                 break;
  49         case FORWARD:
  50                 if (f_search(sp, ep, fm, rp, NULL, NULL, &flags))
  51                         return (1);
  52                 if (F_ISSET(vp, VC_C | VC_D | VC_Y| VC_SH) &&
  53                     fcorrect(sp, ep, vp, fm, rp, flags))
  54                         return (1);
  55                 break;
  56         case NOTSET:
  57                 msgq(sp, M_ERR, "No previous search pattern.");
  58                 return (1);
  59         default:
  60                 abort();
  61         }
  62         return (0);
  63 }
  64
  65 /*
  66  * v_searchN -- N
  67  *      Reverse last search.
  68  */
  69 int
  70 v_searchN(sp, ep, vp, fm, tm, rp)
  71         SCR *sp;
  72         EXF *ep;
  73         VICMDARG *vp;
  74         MARK *fm, *tm, *rp;
  75 {
  76         int flags;
  77
  78         flags = SEARCH_MSG;
  79         if (F_ISSET(vp, VC_C | VC_D | VC_Y))
  80                 flags |= SEARCH_EOL;
  81         switch (sp->searchdir) {
  82         case BACKWARD:
  83                 if (f_search(sp, ep, fm, rp, NULL, NULL, &flags))
  84                         return (1);
  85                 if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
  86                     fcorrect(sp, ep, vp, fm, rp, flags))
  87                         return (1);
  88                 break;
  89         case FORWARD:
  90                 if (b_search(sp, ep, fm, rp, NULL, NULL, &flags))
  91                         return (1);
  92                 if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
  93                     bcorrect(sp, ep, vp, fm, rp, flags))
  94                         return (1);
  95                 break;
  96         case NOTSET:
  97                 msgq(sp, M_ERR, "No previous search pattern.");
  98                 return (1);
  99         default:
 100                 abort();
 101         }
 102         return (0);
 103 }
 104
 105 /*
 106  * v_searchw -- [count]^A
 107  *      Search for the word under the cursor.
 108  */
 109 int
 110 v_searchw(sp, ep, vp, fm, tm, rp)
 111         SCR *sp;
 112         EXF *ep;
 113         VICMDARG *vp;
 114         MARK *fm, *tm, *rp;
 115 {
 116         size_t blen, len;
 117         u_int flags;
 118         int rval;
 119         char *bp;
 120
 121         len = vp->kbuflen + sizeof(RE_WSTART) + sizeof(RE_WSTOP);
 122         GET_SPACE(sp, bp, blen, len);
 123         (void)snprintf(bp, blen, "%s%s%s", RE_WSTART, vp->keyword, RE_WSTOP);
 124
 125         flags = SEARCH_MSG;
 126         rval = f_search(sp, ep, fm, rp, bp, NULL, &flags);
 127
 128         FREE_SPACE(sp, bp, blen);
 129         if (rval)
 130                 return (1);
 131         if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
 132             fcorrect(sp, ep, vp, fm, rp, flags))
 133                 return (1);
 134         return (0);
 135 }
 136
 137 /*
 138  * v_searchb -- [count]?RE[? offset]
 139  *      Search backward.
 140  */
 141 int
 142 v_searchb(sp, ep, vp, fm, tm, rp)
 143         SCR *sp;
 144         EXF *ep;
 145         VICMDARG *vp;
 146         MARK *fm, *tm, *rp;
 147 {
 148         int flags;
 149         char *ptrn;
 150
 151         if (F_ISSET(vp, VC_ISDOT))
 152                 ptrn = NULL;
 153         else {
 154                 if (getptrn(sp, ep, '?', &ptrn))
 155                         return (1);
 156                 if (ptrn == NULL)
 157                         return (0);
 158         }
 159
 160         flags = SEARCH_MSG | SEARCH_PARSE | SEARCH_SET | SEARCH_TERM;
 161         if (F_ISSET(vp, VC_C | VC_D | VC_Y))
 162                 flags |= SEARCH_EOL;
 163         if (b_search(sp, ep, fm, rp, ptrn, NULL, &flags))
 164                 return (1);
 165         if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
 166             bcorrect(sp, ep, vp, fm, rp, flags))
 167                 return (1);
 168         return (0);
 169 }
 170
 171 /*
 172  * v_searchf -- [count]/RE[/ offset]
 173  *      Search forward.
 174  */
 175 int
 176 v_searchf(sp, ep, vp, fm, tm, rp)
 177         SCR *sp;
 178         EXF *ep;
 179         VICMDARG *vp;
 180         MARK *fm, *tm, *rp;
 181 {
 182         int flags;
 183         char *ptrn;
 184
 185         if (F_ISSET(vp, VC_ISDOT))
 186                 ptrn = NULL;
 187         else {
 188                 if (getptrn(sp, ep, '/', &ptrn))
 189                         return (1);
 190                 if (ptrn == NULL)
 191                         return (0);
 192         }
 193
 194         flags = SEARCH_MSG | SEARCH_PARSE | SEARCH_SET | SEARCH_TERM;
 195         if (F_ISSET(vp, VC_C | VC_D | VC_Y))
 196                 flags |= SEARCH_EOL;
 197         if (f_search(sp, ep, fm, rp, ptrn, NULL, &flags))
 198                 return (1);
 199         if (F_ISSET(vp, VC_C | VC_D | VC_Y | VC_SH) &&
 200             fcorrect(sp, ep, vp, fm, rp, flags))
 201                 return (1);
 202         return (0);
 203 }
 204
 205 /*
 206  * getptrn --
 207  *      Get the search pattern.
 208  */
 209 static int
 210 getptrn(sp, ep, prompt, storep)
 211         SCR *sp;
 212         EXF *ep;
 213         int prompt;
 214         char **storep;
 215 {
 216         TEXT *tp;
 217
 218         if (sp->s_get(sp, ep, &sp->tiq, prompt,
 219             TXT_BS | TXT_CR | TXT_ESCAPE | TXT_PROMPT) != INP_OK)
 220                 return (1);
 221
 222         /* Len is 0 if backspaced over the prompt, 1 if only CR entered. */
 223         tp = sp->tiq.cqh_first;
 224         if (tp->len == 0)
 225                 *storep = NULL;
 226         else
 227                 *storep = tp->lb;
 228         return (0);
 229 }
 230
 231 /*
 232  * !!!
 233  * Historically, commands didn't affect the line searched to if the motion
 234  * command was a search and the pattern match was the start or end of the
 235  * line.  There were some special cases, however, concerning search to the
 236  * start of end of a line.
 237  *
 238  * Vi was not, however, consistent, and it was fairly easy to confuse it.
 239  * For example, given the two lines:
 240  *
 241  *      abcdefghi
 242  *      ABCDEFGHI
 243  *
 244  * placing the cursor on the 'A' and doing y?$ would so confuse it that 'h'
 245  * 'k' and put would no longer work correctly.  In any case, we try to do
 246  * the right thing, but it's not likely exactly match historic practice.
 247  */
 248
 249 /*
 250  * bcorrect --
 251  *      Handle command with a backward search as the motion.
 252  */
 253 static int
 254 bcorrect(sp, ep, vp, fm, rp, flags)
 255         SCR *sp;
 256         EXF *ep;
 257         VICMDARG *vp;
 258         MARK *fm, *rp;
 259         u_int flags;
 260 {
 261         size_t len;
 262         char *p;
 263
 264         /*
 265          * !!!
 266          * Correct backward searches which start at column 0 to be one
 267          * past the last column of the previous line.
 268          *
 269          * Backward searches become line mode operations if they start
 270          * at column 0 and end at column 0 of another line.
 271          */
 272         if (fm->lno > rp->lno && fm->cno == 0) {
 273                 if ((p = file_gline(sp, ep, --fm->lno, &len)) == NULL) {
 274                         GETLINE_ERR(sp, rp->lno);
 275                         return (1);
 276                 }
 277                 if (rp->cno == 0)
 278                         F_SET(vp, VC_LMODE);
 279                 fm->cno = len;
 280         }
 281
 282         /*
 283          * !!!
 284          * Commands would become line mode operations if there was a delta
 285          * specified to the search pattern.
 286          */
 287         if (LF_ISSET(SEARCH_DELTA)) {
 288                 F_SET(vp, VC_LMODE);
 289                 return (0);
 290         }
 291         return (0);
 292 }
 293
 294 /*
 295  * fcorrect --
 296  *      Handle command with a forward search as the motion.
 297  */
 298 static int
 299 fcorrect(sp, ep, vp, fm, rp, flags)
 300         SCR *sp;
 301         EXF *ep;
 302         VICMDARG *vp;
 303         MARK *fm, *rp;
 304         u_int flags;
 305 {
 306         size_t len;
 307         char *p;
 308
 309         /*
 310          * !!!
 311          * Correct forward searches which end at column 0 to be one
 312          * past the last column of the previous line.
 313          *
 314          * Forward searches become line mode operations if they start
 315          * at column 0 and end at column 0 of another line.
 316          */
 317         if (fm->lno < rp->lno && rp->cno == 0) {
 318                 if ((p = file_gline(sp, ep, --rp->lno, &len)) == NULL) {
 319                         GETLINE_ERR(sp, rp->lno);
 320                         return (1);
 321                 }
 322                 if (fm->cno == 0)
 323                         F_SET(vp, VC_LMODE);
 324                 rp->cno = len;
 325         }
 326
 327         /*
 328          * !!!
 329          * Commands would become line mode operations if there was a delta
 330          * specified to the search pattern.
 331          */
 332         if (LF_ISSET(SEARCH_DELTA)) {
 333                 F_SET(vp, VC_LMODE);
 334                 return (0);
 335         }
 336
 337         return (0);
 338 }