MySQL 5.1: mysql/src/5.1-dbg/cmd-line-utils/libedit/hist.c Source File
mysql/src/5.1-dbg/cmd-line-utils/libedit/hist.c

00001 /*      $NetBSD: hist.c,v 1.15 2003/11/01 23:36:39 christos Exp $       */
00002 
00003 /*-
00004  * Copyright (c) 1992, 1993
00005  *      The Regents of the University of California.  All rights reserved.
00006  *
00007  * This code is derived from software contributed to Berkeley by
00008  * Christos Zoulas of Cornell University.
00009  *
00010  * Redistribution and use in source and binary forms, with or without
00011  * modification, are permitted provided that the following conditions
00012  * are met:
00013  * 1. Redistributions of source code must retain the above copyright
00014  *    notice, this list of conditions and the following disclaimer.
00015  * 2. Redistributions in binary form must reproduce the above copyright
00016  *    notice, this list of conditions and the following disclaimer in the
00017  *    documentation and/or other materials provided with the distribution.
00018  * 3. Neither the name of the University nor the names of its contributors
00019  *    may be used to endorse or promote products derived from this software
00020  *    without specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00023  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00025  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00026  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00027  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00028  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00029  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00030  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00031  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00032  * SUCH DAMAGE.
00033  */
00034 
00035 #include <config.h>
00036 
00037 /*
00038  * hist.c: History access functions
00039  */
00040 #include <stdlib.h>
00041 #include "el.h"
00042 
00043 /* hist_init():
00044  *      Initialization function.
00045  */
00046 protected int
00047 hist_init(EditLine *el)
00048 {
00049 
00050         el->el_history.fun = NULL;
00051         el->el_history.ref = NULL;
00052         el->el_history.buf = (char *) el_malloc(EL_BUFSIZ);
00053         el->el_history.sz  = EL_BUFSIZ;
00054         if (el->el_history.buf == NULL)
00055                 return (-1);
00056         el->el_history.last = el->el_history.buf;
00057         return (0);
00058 }
00059 
00060 
00061 /* hist_end():
00062  *      clean up history;
00063  */
00064 protected void
00065 hist_end(EditLine *el)
00066 {
00067 
00068         el_free((ptr_t) el->el_history.buf);
00069         el->el_history.buf = NULL;
00070 }
00071 
00072 
00073 /* hist_set():
00074  *      Set new history interface
00075  */
00076 protected int
00077 hist_set(EditLine *el, hist_fun_t fun, ptr_t ptr)
00078 {
00079 
00080         el->el_history.ref = ptr;
00081         el->el_history.fun = fun;
00082         return (0);
00083 }
00084 
00085 
00086 /* hist_get():
00087  *      Get a history line and update it in the buffer.
00088  *      eventno tells us the event to get.
00089  */
00090 protected el_action_t
00091 hist_get(EditLine *el)
00092 {
00093         const char *hp;
00094         int h;
00095 
00096         if (el->el_history.eventno == 0) {      /* if really the current line */
00097                 (void) strncpy(el->el_line.buffer, el->el_history.buf,
00098                     el->el_history.sz);
00099                 el->el_line.lastchar = el->el_line.buffer +
00100                     (el->el_history.last - el->el_history.buf);
00101 
00102 #ifdef KSHVI
00103                 if (el->el_map.type == MAP_VI)
00104                         el->el_line.cursor = el->el_line.buffer;
00105                 else
00106 #endif /* KSHVI */
00107                         el->el_line.cursor = el->el_line.lastchar;
00108 
00109                 return (CC_REFRESH);
00110         }
00111         if (el->el_history.ref == NULL)
00112                 return (CC_ERROR);
00113 
00114         hp = HIST_FIRST(el);
00115 
00116         if (hp == NULL)
00117                 return (CC_ERROR);
00118 
00119         for (h = 1; h < el->el_history.eventno; h++)
00120                 if ((hp = HIST_NEXT(el)) == NULL) {
00121                         el->el_history.eventno = h;
00122                         return (CC_ERROR);
00123                 }
00124         (void) strlcpy(el->el_line.buffer, hp,
00125                         (size_t)(el->el_line.limit - el->el_line.buffer));
00126         el->el_line.lastchar = el->el_line.buffer + strlen(el->el_line.buffer);
00127 
00128         if (el->el_line.lastchar > el->el_line.buffer
00129             && el->el_line.lastchar[-1] == '\n')
00130                 el->el_line.lastchar--;
00131         if (el->el_line.lastchar > el->el_line.buffer
00132             && el->el_line.lastchar[-1] == ' ')
00133                 el->el_line.lastchar--;
00134 #ifdef KSHVI
00135         if (el->el_map.type == MAP_VI)
00136                 el->el_line.cursor = el->el_line.buffer;
00137         else
00138 #endif /* KSHVI */
00139                 el->el_line.cursor = el->el_line.lastchar;
00140 
00141         return (CC_REFRESH);
00142 }
00143 
00144 
00145 /* hist_command()
00146  *      process a history command
00147  */
00148 protected int
00149 hist_command(EditLine *el, int argc, const char **argv)
00150 {
00151         const char *str;
00152         int num;
00153         HistEvent ev;
00154 
00155         if (el->el_history.ref == NULL)
00156                 return (-1);
00157 
00158         if (argc == 1 || strcmp(argv[1], "list") == 0) {
00159                  /* List history entries */
00160 
00161                 for (str = HIST_LAST(el); str != NULL; str = HIST_PREV(el))
00162                         (void) fprintf(el->el_outfile, "%d %s",
00163                             el->el_history.ev.num, str);
00164                 return (0);
00165         }
00166 
00167         if (argc != 3)
00168                 return (-1);
00169 
00170         num = (int)strtol(argv[2], NULL, 0);
00171 
00172         if (strcmp(argv[1], "size") == 0)
00173                 return history(el->el_history.ref, &ev, H_SETSIZE, num);
00174 
00175         if (strcmp(argv[1], "unique") == 0)
00176                 return history(el->el_history.ref, &ev, H_SETUNIQUE, num);
00177 
00178         return -1;
00179 }
00180 
00181 /* hist_enlargebuf()
00182  *      Enlarge history buffer to specified value. Called from el_enlargebufs().
00183  *      Return 0 for failure, 1 for success.
00184  */
00185 protected int
00186 /*ARGSUSED*/
00187 hist_enlargebuf(EditLine *el, size_t oldsz, size_t newsz)
00188 {
00189         char *newbuf;
00190 
00191         newbuf = realloc(el->el_history.buf, newsz);
00192         if (!newbuf)
00193                 return 0;
00194 
00195         (void) memset(&newbuf[oldsz], '\0', newsz - oldsz);
00196 
00197         el->el_history.last = newbuf +
00198                                 (el->el_history.last - el->el_history.buf);
00199         el->el_history.buf = newbuf;
00200         el->el_history.sz  = newsz;
00201 
00202         return 1;
00203 }
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