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// SPDX-License-Identifier: GPL-2.0-or-later
#include "config.h"
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "basics.h"
#include "get_value.h"
/* prompt the user with the name of the field being changed and the
current value.
return value:
0 -> success
< 0 -> error, -errno as code
input argument:
NULL -> Ctrl-D was pressed
"" -> Field was cleard by user. User can enter a space or
"none" to do this.
def -> User entered only <return>.
input -> User entered something new . */
int
get_value(const char *def, const char *prompt, char **input)
{
char buf[BUFSIZ];
char *cp;
*input = NULL;
printf("\t%s [%s]: ", prompt, strempty(def));
if (fgets(buf, sizeof(buf), stdin) != buf)
{
/* print newline to get defined output. */
printf("\n");
return 0;
}
if ((cp = strchr(buf, '\n')) != NULL)
*cp = '\0';
if (buf[0]) /* something is entered */
{
/* if none is entered, return an empty string. If somebody
wishes to enter "none", he as to add a space. */
if(strcasecmp("none", buf) == 0)
{
*input = strdup("");
if (*input == NULL)
return -ENOMEM;
return 0;
}
/* Remove leading and trailing whitespace. This also
makes it possible to change the field to empty or
"none" by entering a space. */
/* cp should point to the trailing '\0'. */
cp = &buf[strlen(buf)];
while(--cp >= buf && isspace(*cp))
;
*++cp = '\0';
cp = buf;
while (*cp && isspace(*cp))
cp++;
*input = strdup(cp);
if (*input == NULL)
return -ENOMEM;
return 0;
}
*input = strdup(strempty(def));
if (*input == NULL)
return -ENOMEM;
return 0;
}
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