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Patch from solar to fix problems with get_name()

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This commit is contained in:
Eric Andersen 2004-08-12 16:52:00 +00:00
parent 4014ab1c60
commit 9940e081c9
1 changed files with 28 additions and 23 deletions
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51
libbb/interface.c
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@ -15,7 +15,7 @@
* that either displays or sets the characteristics of
* one or more of the system's networking interfaces.
*
* Version: $Id: interface.c,v 1.23 2004/07/23 01:49:46 bug1 Exp $
* Version: $Id: interface.c,v 1.24 2004/08/12 16:52:00 andersen Exp $
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* and others. Copyright 1993 MicroWalt Corporation
@ -986,31 +986,36 @@ static int if_readconf(void)
return err;
}
static char *get_name(char *name, char *p)
char *get_name(char *name, char *p)
{
while (isspace(*p))
p++;
while (*p) {
if (isspace(*p))
break;
if (*p == ':') { /* could be an alias */
char *dot = p, *dotname = name;
*name++ = *p++;
while (isdigit(*p))
*name++ = *p++;
if (*p != ':') { /* it wasn't, backup */
p = dot;
name = dotname;
}
if (*p == '\0')
return NULL;
p++;
break;
/* Extract <name>[:<alias>] from nul-terminated p where p matches
<name>[:<alias>]: after leading whitespace.
If match is not made, set name empty and return unchanged p */
int namestart=0, nameend=0, aliasend;
while (isspace(p[namestart]))
namestart++;
nameend=namestart;
while (p[nameend] && p[nameend]!=':' && !isspace(p[nameend]))
nameend++;
if (p[nameend]==':') {
aliasend=nameend+1;
while (p[aliasend] && isdigit(p[aliasend]))
aliasend++;
if (p[aliasend]==':') {
nameend=aliasend;
}
*name++ = *p++;
if ((nameend-namestart)<IFNAMSIZ) {
memcpy(name,&p[namestart],nameend-namestart);
name[nameend-namestart]='\0';
p=&p[nameend];
} else {
/* Interface name too large */
name[0]='\0';
}
} else {
/* first ':' not found - return empty */
name[0]='\0';
}
*name++ = '\0';
return p;
}