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-rw-r--r--src/util/split_nameval.c97
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diff --git a/src/util/split_nameval.c b/src/util/split_nameval.c
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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);
+}