lib/sl/sl.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include <config.h>
  41 RCSID("$Id$");
  42 #endif
  43
  44 #include "sl_locl.h"
  45
  46 static SL_cmd *
  47 sl_match (SL_cmd *cmds, char *cmd, int exactp)
  48 {
  49     SL_cmd *c, *current = NULL, *partial_cmd = NULL;
  50     int partial_match = 0;
  51
  52     for (c = cmds; c->name; ++c) {
  53         if (c->func)
  54             current = c;
  55         if (strcmp (cmd, c->name) == 0)
  56             return current;
  57         else if (strncmp (cmd, c->name, strlen(cmd)) == 0 &&
  58                  partial_cmd != current) {
  59             ++partial_match;
  60             partial_cmd = current;
  61         }
  62     }
  63     if (partial_match == 1 && !exactp)
  64         return partial_cmd;
  65     else
  66         return NULL;
  67 }
  68
  69 void
  70 sl_help (SL_cmd *cmds, int argc, char **argv)
  71 {
  72     SL_cmd *c, *prev_c;
  73
  74     if (argc == 1) {
  75         prev_c = NULL;
  76         for (c = cmds; c->name; ++c) {
  77             if (c->func) {
  78                 if(prev_c)
  79                     printf ("\n\t%s%s", prev_c->usage ? prev_c->usage : "",
  80                             prev_c->usage ? "\n" : "");
  81                 prev_c = c;
  82                 printf ("%s", c->name);
  83             } else
  84                 printf (", %s", c->name);
  85         }
  86         if(prev_c)
  87             printf ("\n\t%s%s", prev_c->usage ? prev_c->usage : "",
  88                     prev_c->usage ? "\n" : "");
  89     } else {
  90         c = sl_match (cmds, argv[1], 0);
  91         if (c == NULL)
  92             printf ("No such command: %s. Try \"help\" for a list of all commands\n",
  93                     argv[1]);
  94         else {
  95             printf ("%s\t%s", c->name, c->usage);
  96             if((++c)->name && c->func == NULL) {
  97                 printf ("\nSynonyms:");
  98                 while (c->name && c->func == NULL)
  99                     printf ("\t%s", (c++)->name);
 100             }
 101             printf ("\n");
 102         }
 103     }
 104 }
 105
 106 #ifdef HAVE_READLINE
 107
 108 char *readline(char *prompt);
 109 void add_history(char *p);
 110
 111 #else
 112
 113 static char *
 114 readline(char *prompt)
 115 {
 116     char buf[BUFSIZ];
 117     printf ("%s", prompt);
 118     fflush (stdout);
 119     if(fgets(buf, sizeof(buf), stdin) == NULL)
 120         return NULL;
 121     if (buf[strlen(buf) - 1] == '\n')
 122         buf[strlen(buf) - 1] = '\0';
 123     return strdup(buf);
 124 }
 125
 126 static void
 127 add_history(char *p)
 128 {
 129 }
 130
 131 #endif
 132
 133 int
 134 sl_command(SL_cmd *cmds, int argc, char **argv)
 135 {
 136     SL_cmd *c;
 137     c = sl_match (cmds, argv[0], 0);
 138     if (c == NULL)
 139         return -1;
 140     return (*c->func)(argc, argv);
 141 }
 142
 143 int
 144 sl_loop (SL_cmd *cmds, char *prompt)
 145 {
 146     unsigned max_count;
 147     char **ptr;
 148     int ret;
 149
 150     max_count = 17;
 151     ptr = malloc(max_count * sizeof(*ptr));
 152     if (ptr == NULL) {
 153         printf ("sl_loop: failed to allocate %u bytes of memory\n",
 154                 (int) max_count * sizeof(*ptr));
 155         return -1;
 156     }
 157
 158     for (;;) {
 159         char *buf;
 160         unsigned count;
 161         SL_cmd *c;
 162
 163         ret = 0;
 164         buf = readline(prompt);
 165         if(buf == NULL)
 166             break;
 167
 168         if(*buf)
 169             add_history(buf);
 170         count = 0;
 171         {
 172             char *foo = NULL;
 173             char *p;
 174
 175             for(p = strtok_r (buf, " \t", &foo);
 176                 p;
 177                 p = strtok_r (NULL, " \t", &foo)) {
 178                 if(count == max_count) {
 179                     max_count *= 2;
 180                     ptr = realloc (ptr, max_count * sizeof(*ptr));
 181                     if (ptr == NULL) {
 182                         printf ("sl_loop: failed to allocate %u "
 183                                 "bytes of memory\n",
 184                                 (unsigned) max_count * sizeof(*ptr));
 185                         return -1;
 186                     }
 187                 }
 188                 ptr[count++] = p;
 189             }
 190         }
 191         if (count > 0) {
 192             c = sl_match (cmds, ptr[0], 0);
 193             if (c) {
 194                 ret = (*c->func)(count, ptr);
 195                 if (ret != 0) {
 196                     free (buf);
 197                     break;
 198                 }
 199             } else
 200                 printf ("Unrecognized command: %s\n", ptr[0]);
 201         }
 202         free(buf);
 203     }
 204     free (ptr);
 205     return 0;
 206 }