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/*++
/* NAME
/* split_nameval 3
/* SUMMARY
/* name-value splitter
/* SYNOPSIS
/* #include <split_nameval.h>
/*
/* const char *split_nameval(buf, name, value)
/* char *buf;
/* char **name;
/* char **value;
/* DESCRIPTION
/* split_nameval() takes a logical line from readlline() and expects
/* text of the form "name = value" or "name =". The buffer
/* argument is broken up into name and value substrings.
/*
/* Arguments:
/* .IP buf
/* Result from readlline() or equivalent. The buffer is modified.
/* .IP name
/* Upon successful completion, this is set to the name
/* substring.
/* .IP value
/* Upon successful completion, this is set to the value
/* substring.
/* FEATURES
/* SEE ALSO
/* dict(3) mid-level dictionary routines
/* BUGS
/* DIAGNOSTICS
/* Fatal errors: out of memory.
/*
/* The result is a null pointer in case of success, a string
/* describing the error otherwise: missing '=' after attribute
/* name; missing attribute name.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include "sys_defs.h"
#include <ctype.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <stringops.h>
/* split_nameval - split text into name and value */
const char *split_nameval(char *buf, char **name, char **value)
{
char *np; /* name substring */
char *vp; /* value substring */
char *cp;
char *ep;
/*
* Ugly macros to make complex expressions less unreadable.
*/
#define SKIP(start, var, cond) do { \
for (var = start; *var && (cond); var++) \
/* void */; \
} while (0)
#define TRIM(s) do { \
char *p; \
for (p = (s) + strlen(s); p > (s) && ISSPACE(p[-1]); p--) \
/* void */; \
*p = 0; \
} while (0)
SKIP(buf, np, ISSPACE(*np)); /* find name begin */
if (*np == 0 || *np == '=')
return ("missing attribute name");
SKIP(np, ep, !ISSPACE(*ep) && *ep != '='); /* find name end */
SKIP(ep, cp, ISSPACE(*cp)); /* skip blanks before '=' */
if (*cp != '=') /* need '=' */
return ("missing '=' after attribute name");
*ep = 0; /* terminate name */
cp++; /* skip over '=' */
SKIP(cp, vp, ISSPACE(*vp)); /* skip leading blanks */
TRIM(vp); /* trim trailing blanks */
*name = np;
*value = vp;
return (0);
}
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