Minix2.0/src/commands/elle/eesrch.c
/* ELLE - Copyright 1982, 1984, 1987 by Ken Harrenstien, SRI International
* This software is quasi-public; it may be used freely with
* like software, but may NOT be sold or made part of licensed
* products without permission of the author.
*/
/*
* EESRCH Searching functions
*/
#include "elle.h"
#if !(V6)
#include <signal.h>
#else
#include "eesigs.h" /* Use this on V6 system */
#endif /*V6*/
/*
* Buffer String Search routines
*
* If no search string is provided, a string that was previously
* used in the last search is once again used.
*/
/* EFUN: "String Search" */
f_srch()
{ return (lin_search (0));
}
/* EFUN: "Reverse String Search" */
f_rsrch()
{ return (lin_search (1));
}
/* LIN_SEARCH - Main routine for non-incremental String Search. Asks for
* a search string and looks for it.
*/
lin_search (backwards)
int backwards;
{ register char *mem; /* item to be searched for */
register int res;
int srchint(), (*sav_srchalarm)();
char *srch_ask();
chroff savdot;
savdot = cur_dot; /* Save original loc */
#if ICONOGRAPHICS
if((mem = srch_ask(backwards ? "Reverse Search%s%s%s"
: "Search%s%s%s"))==0)
return;
#else
if((mem = srch_ask(backwards ? "Reverse Search: " : "Search: "))==0)
return;
#endif /*-ICONOGRAPHICS*/
sav_srchalarm = signal(SIGALRM,/*&*/srchint); /* Handle timeout */
alarm(1); /* One sec from now */
res = e_search(mem,srch_len,backwards); /* Search for str! */
alarm(0); /* Turn off alarm */
signal(SIGALRM,sav_srchalarm); /* Restore old handler */
if(res) /* Search won? */
{ ed_setcur();
return;
}
/* Search failed */
e_gosetcur(savdot);
ding("Search Failed");
}
srchint()
{ yelltoo(" ...");
}
char *
srch_ask(prompt)
char *prompt;
{ register char *ans, *old;
#if ICONOGRAPHICS
if (srch_str)
ans = ask(prompt, " (", srch_str, "): ");
else ans = ask (prompt, ": ", "", "");
if (ans == 0) return (0);
#else
if((ans = ask(prompt)) == 0)
return(0); /* user punted ... */
#endif /*-ICONOGRAPHICS*/
old = srch_str;
if (*ans == '\0')
{ chkfree(ans);
if ((ans = old) == 0) /* no string specified */
{ dingtoo("Nothing to search for");
return(0);
}
#if !(ICONOGRAPHICS)
saylntoo(old, srch_len); /* Show what old string is */
#endif /*-ICONOGRAPHICS*/
}
else
{ if (old)
chkfree(old); /* free up old srch string */
srch_str = ans;
srch_len = ask_len;
}
return(ans);
}
#if 0
Incremental Search stuff.
Description of EMACS behavior:
^Q quotes next char.
DEL cancels last char. If this cancelled a match, point is moved
to previous match.
If not all of input can be found, it is not discarded. Can rub out,
discard unmatched stuff with ^G, exit, etc.
^S repeats search forward; ^R repeats backward.
If empty string, either
changes direction (if not same)
or brings back previous string
ESC exits. If empty string, changes to non-incremental string search.
^G of a winning search aborts, exits, and moves point back to origin.
^G of a failing search discards the input that wasn''t found.
Other C- or M- chars exit and are executed.
ELLE also interprets ^H (BS) as DEL, because some keyboards make it hard to
type DEL and there is no way the user can
re-bind the incremental-search commands.
#endif /*COMMENT*/
#if FX_ISRCH
/* EFUN: "Incremental Search" */
f_isrch() { i_search(0); }
#endif /*FX_ISRCH*/
#if FX_RISRCH
/* EFUN: "Reverse Search" */
f_risrch() { i_search(1); }
#endif /*FX_RISRCH*/
#if FX_ISRCH || FX_RISRCH
i_search(back)
int back; /* Current mode: 0 if forward, 1 if backward */
{ register int c;
register int inpcnt; /* # chars in current input srch str */
int inpgood; /* Length of last winning string */
char inpstr[ISRCHLIM]; /* Holds current input search string */
chroff inpdot[ISRCHLIM]; /* Holds winning addrs for each */
struct window *savwin;
int winning; /* 1 = currently winning, 0 = currently failing */
int pref, shown;
int f_insself(), (*(cmd_fun()))();
winning = 1;
inpcnt = 0;
inpgood = 0;
inpdot[0] = cur_dot;
savwin = cur_win;
/* Set up prompt and read all TTY input thus far */
shown = 0;
sloop: c = cmd_wait(); /* See if any command input waiting */
if(shown || !c)
{ e_setcur(); /* Assume we moved around, so set cur_dot */
chg_win(ask_win);
ed_reset(); /* Flush contents & invoke redisplay */
ed_sins(back ? "R-search: " : "I-search: ");
ed_nsins(inpstr, inpcnt);
if(!winning) ed_sins("\t(FAILING)");
upd_wind((struct window *)0); /* Force ask_win update */
if(c)
{ upd_curs(cur_dot);
tbufls();
}
chg_win(savwin);
shown = 1; /* Say search prompt has been shown */
}
if(!c) /* If no user input waiting, show buffer */
{ redp(RD_MOVE); /* Cursor moved in window */
redisplay();
}
c = cmd_read(); /* Get input char */
switch(c)
{ case DEL: /* Cancel last char */
case BS: /* Hard to type DEL on some kbds */
if(inpcnt <= 0) goto sloop;
if(--inpcnt > inpgood) goto sloop;
winning = 1;
if(inpcnt == inpgood) goto sloop;
inpgood--;
ed_go(inpdot[inpcnt]);
goto sloop;
case CTRL('Q'):
c = cmd_read(); /* Quote next char */
break;
case CTRL('S'):
pref = 0;
goto ctlsr;
case CTRL('R'):
pref = 1;
goto ctlsr;
case CTRL('G'):
if(winning)
{ ed_go(inpdot[0]);
goto sdone;
}
inpcnt = inpgood;
winning = 1;
goto sloop;
case ESC:
case CR:
if(inpcnt)
goto sdone;
lin_search(back);
return;
default:
if(f_insself != cmd_fun(c))
{ unrchf = c;
goto sdone;
}
case TAB: /* Strange self-inserting char */
break;
}
if(inpcnt >= ISRCHLIM-1)
{ ding("I-search str too long");
sleep(1);
goto sdone;
}
inpstr[inpcnt++] = c;
if(!winning) goto sloop;
/* Now search for string. (Arm alarm interrupt?) */
/* cur_dot has current location cursor is at; we want to back off
* from this so a repeated search will find the same location if
* appropriate. */
e_igoff(back ? inpcnt : -(inpcnt-1));
dosrch:
winning = e_search(inpstr,inpcnt,back);
if (winning)
{ inpgood = inpcnt; /* Remember last win length */
inpdot[inpcnt] = e_dot(); /* and location */
}
else e_gocur(); /* Back to start position */
goto sloop;
ctlsr: if (pref != back)
{ back = pref;
if(inpcnt <= 0) goto sloop;
}
if(inpcnt <= 0)
{ if(!srch_str || (inpcnt = srch_len) <= 0)
goto sloop;
bcopy((SBMA)srch_str, (SBMA)inpstr, srch_len);
inpcnt = srch_len;
unrchf = c; /* Repeat cmd after display */
shown = 1; /* Force search-string display */
goto sloop;
}
goto dosrch;
sdone:
if(srch_str) chkfree(srch_str);
srch_str = memalloc((SBMO)(inpcnt+1));
bcopy((SBMA)inpstr,(SBMA)srch_str,inpcnt); /* Copy into srch_str */
srch_len = inpcnt;
e_setcur();
chg_win(ask_win);
ed_reset();
chg_win(savwin);
redp(RD_CHKALL);
}
#endif /*FX_ISRCH || FX_RISRCH*/