| 1 | /* ELLE - Copyright 1982, 1984, 1987 by Ken Harrenstien, SRI International
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| 2 | * This software is quasi-public; it may be used freely with
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| 3 | * like software, but may NOT be sold or made part of licensed
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| 4 | * products without permission of the author.
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| 5 | */
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| 6 | /*
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| 7 | * EESRCH Searching functions
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| 8 | */
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| 9 |
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| 10 | #include "elle.h"
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| 11 | #if !(V6)
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| 12 | #include <signal.h>
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| 13 | #else
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| 14 | #include "eesigs.h" /* Use this on V6 system */
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| 15 | #endif /*V6*/
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| 16 |
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| 17 | /*
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| 18 | * Buffer String Search routines
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| 19 | *
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| 20 | * If no search string is provided, a string that was previously
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| 21 | * used in the last search is once again used.
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| 22 | */
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| 23 |
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| 24 | /* EFUN: "String Search" */
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| 25 | f_srch()
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| 26 | { return (lin_search (0));
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| 27 | }
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| 28 |
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| 29 | /* EFUN: "Reverse String Search" */
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| 30 | f_rsrch()
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| 31 | { return (lin_search (1));
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| 32 | }
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| 33 |
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| 34 | /* LIN_SEARCH - Main routine for non-incremental String Search. Asks for
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| 35 | * a search string and looks for it.
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| 36 | */
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| 37 | lin_search (backwards)
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| 38 | int backwards;
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| 39 | { register char *mem; /* item to be searched for */
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| 40 | register int res;
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| 41 | int srchint(), (*sav_srchalarm)();
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| 42 | char *srch_ask();
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| 43 | chroff savdot;
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| 44 |
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| 45 | savdot = cur_dot; /* Save original loc */
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| 46 |
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| 47 | #if ICONOGRAPHICS
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| 48 | if((mem = srch_ask(backwards ? "Reverse Search%s%s%s"
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| 49 | : "Search%s%s%s"))==0)
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| 50 | return;
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| 51 | #else
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| 52 | if((mem = srch_ask(backwards ? "Reverse Search: " : "Search: "))==0)
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| 53 | return;
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| 54 | #endif /*-ICONOGRAPHICS*/
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| 55 | sav_srchalarm = signal(SIGALRM,/*&*/srchint); /* Handle timeout */
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| 56 | alarm(1); /* One sec from now */
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| 57 |
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| 58 | res = e_search(mem,srch_len,backwards); /* Search for str! */
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| 59 |
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| 60 | alarm(0); /* Turn off alarm */
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| 61 | signal(SIGALRM,sav_srchalarm); /* Restore old handler */
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| 62 |
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| 63 | if(res) /* Search won? */
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| 64 | { ed_setcur();
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| 65 | return;
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| 66 | }
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| 67 |
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| 68 | /* Search failed */
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| 69 | e_gosetcur(savdot);
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| 70 | ding("Search Failed");
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| 71 | }
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| 72 |
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| 73 | srchint()
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| 74 | { yelltoo(" ...");
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| 75 | }
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| 76 |
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| 77 | char *
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| 78 | srch_ask(prompt)
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| 79 | char *prompt;
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| 80 | { register char *ans, *old;
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| 81 |
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| 82 | #if ICONOGRAPHICS
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| 83 | if (srch_str)
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| 84 | ans = ask(prompt, " (", srch_str, "): ");
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| 85 | else ans = ask (prompt, ": ", "", "");
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| 86 | if (ans == 0) return (0);
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| 87 | #else
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| 88 | if((ans = ask(prompt)) == 0)
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| 89 | return(0); /* user punted ... */
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| 90 | #endif /*-ICONOGRAPHICS*/
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| 91 | old = srch_str;
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| 92 | if (*ans == '\0')
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| 93 | { chkfree(ans);
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| 94 | if ((ans = old) == 0) /* no string specified */
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| 95 | { dingtoo("Nothing to search for");
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| 96 | return(0);
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| 97 | }
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| 98 | #if !(ICONOGRAPHICS)
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| 99 | saylntoo(old, srch_len); /* Show what old string is */
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| 100 | #endif /*-ICONOGRAPHICS*/
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| 101 | }
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| 102 | else
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| 103 | { if (old)
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| 104 | chkfree(old); /* free up old srch string */
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| 105 | srch_str = ans;
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| 106 | srch_len = ask_len;
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| 107 | }
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| 108 | return(ans);
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| 109 | }
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| 110 | |
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| 111 |
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| 112 | #if 0
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| 113 | Incremental Search stuff.
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| 114 | Description of EMACS behavior:
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| 115 | ^Q quotes next char.
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| 116 | DEL cancels last char. If this cancelled a match, point is moved
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| 117 | to previous match.
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| 118 | If not all of input can be found, it is not discarded. Can rub out,
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| 119 | discard unmatched stuff with ^G, exit, etc.
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| 120 | ^S repeats search forward; ^R repeats backward.
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| 121 | If empty string, either
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| 122 | changes direction (if not same)
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| 123 | or brings back previous string
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| 124 | ESC exits. If empty string, changes to non-incremental string search.
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| 125 | ^G of a winning search aborts, exits, and moves point back to origin.
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| 126 | ^G of a failing search discards the input that wasn''t found.
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| 127 | Other C- or M- chars exit and are executed.
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| 128 | ELLE also interprets ^H (BS) as DEL, because some keyboards make it hard to
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| 129 | type DEL and there is no way the user can
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| 130 | re-bind the incremental-search commands.
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| 131 | #endif /*COMMENT*/
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| 132 |
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| 133 | #if FX_ISRCH
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| 134 | /* EFUN: "Incremental Search" */
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| 135 | f_isrch() { i_search(0); }
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| 136 | #endif /*FX_ISRCH*/
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| 137 |
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| 138 | #if FX_RISRCH
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| 139 | /* EFUN: "Reverse Search" */
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| 140 | f_risrch() { i_search(1); }
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| 141 | #endif /*FX_RISRCH*/
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| 142 |
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| 143 | #if FX_ISRCH || FX_RISRCH
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| 144 |
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| 145 | i_search(back)
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| 146 | int back; /* Current mode: 0 if forward, 1 if backward */
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| 147 | { register int c;
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| 148 | register int inpcnt; /* # chars in current input srch str */
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| 149 | int inpgood; /* Length of last winning string */
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| 150 | char inpstr[ISRCHLIM]; /* Holds current input search string */
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| 151 | chroff inpdot[ISRCHLIM]; /* Holds winning addrs for each */
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| 152 | struct window *savwin;
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| 153 | int winning; /* 1 = currently winning, 0 = currently failing */
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| 154 | int pref, shown;
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| 155 | int f_insself(), (*(cmd_fun()))();
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| 156 |
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| 157 | winning = 1;
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| 158 | inpcnt = 0;
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| 159 | inpgood = 0;
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| 160 | inpdot[0] = cur_dot;
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| 161 | savwin = cur_win;
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| 162 |
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| 163 | /* Set up prompt and read all TTY input thus far */
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| 164 | shown = 0;
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| 165 | sloop: c = cmd_wait(); /* See if any command input waiting */
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| 166 | if(shown || !c)
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| 167 | { e_setcur(); /* Assume we moved around, so set cur_dot */
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| 168 | chg_win(ask_win);
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| 169 | ed_reset(); /* Flush contents & invoke redisplay */
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| 170 | ed_sins(back ? "R-search: " : "I-search: ");
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| 171 | ed_nsins(inpstr, inpcnt);
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| 172 | if(!winning) ed_sins("\t(FAILING)");
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| 173 | upd_wind((struct window *)0); /* Force ask_win update */
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| 174 | if(c)
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| 175 | { upd_curs(cur_dot);
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| 176 | tbufls();
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| 177 | }
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| 178 | chg_win(savwin);
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| 179 | shown = 1; /* Say search prompt has been shown */
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| 180 | }
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| 181 | if(!c) /* If no user input waiting, show buffer */
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| 182 | { redp(RD_MOVE); /* Cursor moved in window */
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| 183 | redisplay();
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| 184 | }
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| 185 | c = cmd_read(); /* Get input char */
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| 186 | switch(c)
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| 187 | { case DEL: /* Cancel last char */
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| 188 | case BS: /* Hard to type DEL on some kbds */
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| 189 | if(inpcnt <= 0) goto sloop;
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| 190 | if(--inpcnt > inpgood) goto sloop;
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| 191 | winning = 1;
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| 192 | if(inpcnt == inpgood) goto sloop;
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| 193 | inpgood--;
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| 194 | ed_go(inpdot[inpcnt]);
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| 195 | goto sloop;
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| 196 |
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| 197 | case CTRL('Q'):
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| 198 | c = cmd_read(); /* Quote next char */
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| 199 | break;
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| 200 | case CTRL('S'):
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| 201 | pref = 0;
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| 202 | goto ctlsr;
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| 203 | case CTRL('R'):
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| 204 | pref = 1;
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| 205 | goto ctlsr;
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| 206 |
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| 207 | case CTRL('G'):
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| 208 | if(winning)
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| 209 | { ed_go(inpdot[0]);
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| 210 | goto sdone;
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| 211 | }
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| 212 | inpcnt = inpgood;
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| 213 | winning = 1;
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| 214 | goto sloop;
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| 215 | case ESC:
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| 216 | case CR:
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| 217 | if(inpcnt)
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| 218 | goto sdone;
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| 219 | lin_search(back);
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| 220 | return;
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| 221 | default:
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| 222 | if(f_insself != cmd_fun(c))
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| 223 | { unrchf = c;
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| 224 | goto sdone;
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| 225 | }
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| 226 | case TAB: /* Strange self-inserting char */
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| 227 | break;
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| 228 | }
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| 229 | if(inpcnt >= ISRCHLIM-1)
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| 230 | { ding("I-search str too long");
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| 231 | sleep(1);
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| 232 | goto sdone;
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| 233 | }
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| 234 | inpstr[inpcnt++] = c;
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| 235 | if(!winning) goto sloop;
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| 236 |
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| 237 | /* Now search for string. (Arm alarm interrupt?) */
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| 238 | /* cur_dot has current location cursor is at; we want to back off
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| 239 | * from this so a repeated search will find the same location if
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| 240 | * appropriate. */
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| 241 | e_igoff(back ? inpcnt : -(inpcnt-1));
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| 242 | dosrch:
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| 243 | winning = e_search(inpstr,inpcnt,back);
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| 244 | if (winning)
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| 245 | { inpgood = inpcnt; /* Remember last win length */
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| 246 | inpdot[inpcnt] = e_dot(); /* and location */
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| 247 | }
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| 248 | else e_gocur(); /* Back to start position */
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| 249 | goto sloop;
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| 250 |
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| 251 | ctlsr: if (pref != back)
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| 252 | { back = pref;
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| 253 | if(inpcnt <= 0) goto sloop;
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| 254 | }
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| 255 | if(inpcnt <= 0)
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| 256 | { if(!srch_str || (inpcnt = srch_len) <= 0)
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| 257 | goto sloop;
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| 258 | bcopy((SBMA)srch_str, (SBMA)inpstr, srch_len);
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| 259 | inpcnt = srch_len;
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| 260 | unrchf = c; /* Repeat cmd after display */
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| 261 | shown = 1; /* Force search-string display */
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| 262 | goto sloop;
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| 263 | }
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| 264 | goto dosrch;
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| 265 |
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| 266 | sdone:
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| 267 | if(srch_str) chkfree(srch_str);
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| 268 | srch_str = memalloc((SBMO)(inpcnt+1));
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| 269 | bcopy((SBMA)inpstr,(SBMA)srch_str,inpcnt); /* Copy into srch_str */
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| 270 | srch_len = inpcnt;
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| 271 | e_setcur();
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| 272 | chg_win(ask_win);
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| 273 | ed_reset();
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| 274 | chg_win(savwin);
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| 275 | redp(RD_CHKALL);
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| 276 | }
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| 277 | #endif /*FX_ISRCH || FX_RISRCH*/
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