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/****************************************************************************/
/* GETPARAM.C: export version prompts user for values. Public routines: */
/* initparam(), getparam(), getiparam(), getbparam(), getrparam(). */
/* */
/* Copyright (c) 1993 by Joshua E. Barnes, Honolulu, HI. */
/* It's free because it's yours. */
/****************************************************************************/
#include "stdinc.h"
#include "real.h"
#include <string.h>
#include <stdlib.h>
void *allocate(int);
void error(string, ...);
local string *defaults = NULL; /* "name=value" strings */
/*
* INITPARAM: ignore arg vector, remember defaults.
*/
void initparam(string *argv, string *defv)
{
defaults = defv;
}
/*
* GETPARAM: export version prompts user for value of name.
*/
local int scanbind(string *, string);
local string extrvalue(string);
string getparam(string name)
{
int i, len;
string def;
char buf[128];
if (defaults == NULL) /* check initialization */
error("getparam: called before initparam\n");
i = scanbind(defaults, name); /* find name in defaults */
if (i < 0)
error("getparam: %s unknown\n", name);
def = extrvalue(defaults[i]); /* extract default value */
if (*def == NULLCHR)
fprintf(stderr, "enter %s: ", name); /* prompt user for value */
else
fprintf(stderr, "enter %s [%s]: ", name, def);
gets(buf); /* read users response */
len = strlen(buf);
if (len > 0) /* if user gave a value... */
return (strcpy((string) allocate(len+1), buf));
else /* else return default */
return (def);
}
/*
* GETIPARAM, ..., GETDPARAM: get int, long, bool, or double parameters.
*/
int getiparam(string name)
{
string val;
for (val = ""; *val == NULLCHR; ) /* while nothing input */
val = getparam(name); /* obtain value from user */
return (atoi(val)); /* convert to an integer */
}
bool getbparam(string name)
{
string val;
for (val = ""; *val == NULLCHR; )
val = getparam(name);
if (strchr("tTyY1", *val) != NULLCHR) /* is value true? */
return (TRUE);
if (strchr("fFnN0", *val) != NULLCHR) /* is value false? */
return (FALSE);
error("getbparam: %s=%s not bool\n", name, val);
return (FALSE);
}
real getrparam(string name)
{
string val;
for (val = ""; *val == NULLCHR; )
val = getparam(name);
return ((real) atof(val)); /* convert & return real */
}
/*
* SCANBIND: scan binding vector for name, return index.
*/
local bool matchname(string, string);
local int scanbind(string bvec[], string name)
{
int i;
for (i = 0; bvec[i] != NULL; i++)
if (matchname(bvec[i], name))
return (i);
return (-1);
}
/*
* MATCHNAME: determine if "name=value" matches "name".
*/
local bool matchname(string bind, string name)
{
char *bp, *np;
bp = bind;
np = name;
while (*bp == *np) {
bp++;
np++;
}
return (*bp == '=' && *np == NULLCHR);
}
/*
* EXTRVALUE: extract value from name=value string.
*/
local string extrvalue(string arg)
{
char *ap;
ap = (char *) arg;
while (*ap != NULLCHR)
if (*ap++ == '=')
return ((string) ap);
return (NULL);
}
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