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lynx-dev patches for cleanup of parse_arg
|
From: |
John E. Davis |
|
Subject: |
lynx-dev patches for cleanup of parse_arg |
|
Date: |
Sat, 25 Apr 1998 03:27:42 -0400 |
Hi,
I spent several hours tonight cleaning up the parse_arg function
in LYMain.c. New features will require more command line options, and
parse_arg is becoming too unwieldy to easily allow expansion. So, I
rewrote it to use a table. A sample table entry is:
{
"useragent", ALLOC_STRING_ARG|NEED_NEXT_ARG, (long)&LYUserAgent,
"=Name set alternate Lynx User-Agent header"
},
As you can seem the help string is associated with the argument,
making it much easier to maintain. New arguments may be added by just
adding a new table entry.
I believe that the parsing of arguments is now cleaner and more
localized, minimizing the risk of bugs, as may be seen by the
following code fragment that parses the table:
.
.
p = Arg_Table;
while (p->name != NULL)
{
int (*fun)(Parse_Args_Type *, char **, char *);
char *next_arg;
if ((p->name[0] != *arg_name)
|| (0 == arg_eqs_parse (p->name, arg_name, &next_arg)))
{
p++;
continue;
}
if ((p->type & NEED_NEXT_ARG) && (next_arg == NULL))
{
next_arg = argv[1];
if ((i != NULL) && (next_arg != NULL))
(*i)++;
}
switch (p->type & ARG_TYPE_MASK)
{
case TOGGLE_ARG:
if (NULL != (int *)p->value)
*(int *)p->value = !(*(int *)p->value);
break;
case SET_ARG:
if (NULL != (int *)p->value)
*(int *)p->value = TRUE;
break;
case UNSET_ARG:
if (NULL != (int *)p->value)
*(int *)p->value = FALSE;
break;
case FUNCTION_ARG:
fun = (int (*)(Parse_Args_Type *, char **, char *))p->value;
if (NULL != fun)
{
if (-1 == (*fun) (p, argv, next_arg))
{
}
}
break;
case ALLOC_STRING_ARG:
if ((next_arg != NULL) && ((char **)p->value != NULL))
StrAllocCopy(*(char **)p->value, next_arg);
break;
case INT_ARG:
if ((next_arg != NULL) && ((int *)p->value != NULL))
*(int *)p->value = atoi (next_arg);
break;
case STRING_ARG:
if ((next_arg != NULL) && ((char **)p->value != NULL))
*(char **)p->value = next_arg;
break;
case IGNORE_ARG:
break;
}
return;
}
if (pgm == NULL) pgm = "LYNX";
fprintf (stderr, "%s: Invalid Option: %s\n", pgm, argv[0]);
print_help_and_exit (-1);
}
To make the diffs as clean as possible, I `ifdef-ed' out a chunk of
code in LYMain.c, and added an include statement to include my new code.
Here is the diff to LYMain.c:
--- LYMain.c.ORIG Fri Apr 24 21:12:18 1998
+++ LYMain.c Sat Apr 25 03:01:10 1998
@@ -1771,6 +1771,10 @@
HTRegisterProtocol(&LYLynxCookies);
}
+#define USE_DAVIS_PARSE_ARG
+#ifdef USE_DAVIS_PARSE_ARG
+#include "parsearg.c"
+#else
/*
* Parse one argument, optionally picking up the next entry in argv (if
* appropriate).
@@ -2835,6 +2839,7 @@
} /* end of switch. */
}
+#endif /* USE_DAVIS_PARSE_ARG */
#ifndef VMS
PRIVATE void FatalProblem ARGS1(
Here is parseargs.c, gzipped and encoded. If you prefer, I can send
it without any encoding:
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end
- lynx-dev patches for cleanup of parse_arg,
John E. Davis <=