WebSVN – SvarDOS – Diff – /svarcom/trunk/cmd/for.c

 /* This file is part of the SvarCOM project and is published under the terms
  * of the MIT license.
+ *
  * Copyright (C) 2021-2022 Mateusz Viste
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
 /*
  * FOR %variable IN (set) DO command [command-parameters]
+ *
  * %variable    a replaceable parameter name
  * (set)        a set of one of more files. Wildcards allowed.
  * command      the command to carry out for each matched file
  * command-parameters   parameters or switches for the specified command
+ *
  * To use FOR in a batch program, use %%variable instead of %variable
+ *
  * the set of files must be surrounded by parenthesis, and may contain one
  * or more space-delimited wildcards. Examples:
  * (file.txt other.txt)
  * (*.exe *.com *.bat)
  * (jan*.txt 199201??.txt)
  */
 /* Implementation notes:
+ *
  * For cannot be nested (no "FOR ... do FOR ..." allowed)
+ *
  * When executed, FOR allocates a "FOR context" to RMOD's memory, this context
  * holds the memory state of a FindNext iteration, as well as the command
  * to run on each matched file.
+ *
  * This FOR context is looked at by command.c and used to provide a command
  * instead of getting the command from interactive cli or BAT file. Repeats
  * until the FindNext buffer stops matching files.
+ *
  * This file only provides the help screen of FOR, as well as the FOR-context
  * initialization. Actual execution happens within command.c.
  */
 static enum cmd_result cmd_for(struct cmd_funcparam *p) {
+  struct forctx *f = (void *)(p->BUFFER);
+  unsigned short i;
+  /* forbid nested FORs */
+  if (p->rmod->forloop) {
+    nls_outputnl(18,7); /* FOR cannot be nested */
+    return(CMD_FAIL);
+  }
   /* help screen ONLY if /? is the only argument */
   if ((p->argc == 1) && (imatch(p->argv[0], "/?"))) {
     nls_outputnl(18,0); /* "Runs a specified command for each file in a set of files" */
     outputnl("");
     nls_outputnl(18,1); /* "FOR %variable IN (set) DO command [parameters]" */
     outputnl("");
     nls_outputnl(18,2); /* "%variable    a replaceable parameter name" */
     nls_outputnl(18,3); /* "(set)        a set of one of more files. Wildcards allowed." */
     nls_outputnl(18,4); /* "command      the command to carry out for each matched file" */
     nls_outputnl(18,5); /* "parameters   parameters or switches for the specified command" */
     outputnl("");
     nls_outputnl(18,6); /* "To use FOR in a batch program, use %%variable instead of %variable" */
     return(CMD_OK);
+  }
+  /* clear out struct and copy command line to it */
+  bzero(f, sizeof(*f));
+  strcpy(f->cmd, p->cmdline);
+  /* locate the %varname */
+  i = p->argoffset;
+  while (f->cmd[i] == ' ') i++;
-  outputnl("FOR IS NOT IMPLEMENTED YET");
+  if (f->cmd[i] != '%') goto INVALID_SYNTAX;
+  f->varname = i;
+  /* find the end of varname (space) */
+  while ((f->cmd[i] != ' ') && (f->cmd[i] != 0)) i++;
+  if (f->cmd[i] != ' ') goto INVALID_SYNTAX;
+  f->cmd[i++] = 0; /* terminate varname and move to next field */
+  /* look (and skip) the "IN" part */
+  while (f->cmd[i] == ' ') i++;
+  if (((f->cmd[i] & 0xDF) != 'I') && ((f->cmd[i+1] & 0xDF) != 'N') && (f->cmd[i+2] != ' ')) goto INVALID_SYNTAX;
+  i += 3;
+  /* look for patterns start */
+  while (f->cmd[i] == ' ') i++;
+  if (f->cmd[i] != '(') goto INVALID_SYNTAX;
+  i++;
+  while (f->cmd[i] == ' ') i++;
+  f->curpat = i;
+  /* look for patterns end */
+  while ((f->cmd[i] != ')') && (f->cmd[i] != 0)) i++;
+  if (f->cmd[i] != ')') goto INVALID_SYNTAX;
+  f->cmd[i++] = 0; /* terminate patterns and move to next field */
+  /* look (and skip) the "DO" part */
+  while (f->cmd[i] == ' ') i++;
+  if (((f->cmd[i] & 0xDF) != 'D') && ((f->cmd[i+1] & 0xDF) != 'O') && (f->cmd[i+2] != ' ')) goto INVALID_SYNTAX;
+  i += 3;
+  while (f->cmd[i] == ' ') i++;
+  /* rest is the exec string */
+  f->exec = i;
+  /* alloc memory for the forctx context and copy f to it */
+  p->rmod->forloop = rmod_fcalloc(sizeof(*f), p->rmod->rmodseg, "SVFORCTX");
+  if (p->rmod->forloop == NULL) {
+    nls_outputnl_doserr(8);
+    return(CMD_FAIL);
+  }
+  _fmemcpy(p->rmod->forloop, f, sizeof(*f));
   return(CMD_OK);
+  INVALID_SYNTAX:
+  nls_outputnl(0,1); /* "Invalid syntax" */
+  return(CMD_FAIL);
+}

Subversion Repositories SvarDOS

(root)/svarcom/trunk/cmd/for.c – Rev 982 → 1023