Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 199 insertions, 0 deletions

diff --git a/src/util/mac_parse.c b/src/util/mac_parse.c
new file mode 100644
index 0000000..45b717a
--- /dev/null
+++ b/src/util/mac_parse.c
@@ -0,0 +1,199 @@
+/*++
+/* NAME
+/*	mac_parse 3
+/* SUMMARY
+/*	locate macro references in string
+/* SYNOPSIS
+/*	#include <mac_parse.h>
+/*
+/*	int	mac_parse(string, action, context)
+/*	const char *string;
+/*	int	(*action)(int type, VSTRING *buf, void *context);
+/* DESCRIPTION
+/*	This module recognizes macro expressions in null-terminated
+/*	strings.  Macro expressions have the form $name, $(text) or
+/*	${text}. A macro name consists of alphanumerics and/or
+/*	underscore. Text other than macro expressions is treated
+/*	as literal text.
+/*
+/*	mac_parse() breaks up its string argument into macro references
+/*	and other text, and invokes the \fIaction\fR routine for each item
+/*	found.  With each action routine call, the \fItype\fR argument
+/*	indicates what was found, \fIbuf\fR contains a copy of the text
+/*	found, and \fIcontext\fR is passed on unmodified from the caller.
+/*	The application is at liberty to clobber \fIbuf\fR.
+/* .IP MAC_PARSE_LITERAL
+/*	The content of \fIbuf\fR is literal text.
+/* .IP MAC_PARSE_EXPR
+/*	The content of \fIbuf\fR is a macro expression: either a
+/*	bare macro name without the preceding "$", or all the text
+/*	inside $() or ${}.
+/* .PP
+/*	The action routine result value is the bit-wise OR of zero or more
+/*	of the following:
+/* .IP	MAC_PARSE_ERROR
+/*	A parsing error was detected.
+/* .IP	MAC_PARSE_UNDEF
+/*	A macro was expanded but not defined.
+/* .PP
+/*	Use the constant MAC_PARSE_OK when no error was detected.
+/* SEE ALSO
+/*	dict(3) dictionary interface.
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory. malformed macro name.
+/*
+/*	The result value is the bit-wise OR of zero or more of the
+/*	following:
+/* .IP	MAC_PARSE_ERROR
+/*	A parsing error was detected.
+/* .IP	MAC_PARSE_UNDEF
+/*	A macro was expanded but not defined.
+/* 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 library. */
+
+#include <sys_defs.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mac_parse.h>
+
+ /*
+  * Helper macro for consistency. Null-terminate the temporary buffer,
+  * execute the action, and reset the temporary buffer for re-use.
+  */
+#define MAC_PARSE_ACTION(status, type, buf, context) \
+	do { \
+	    VSTRING_TERMINATE(buf); \
+	    status |= action((type), (buf), (context)); \
+	    VSTRING_RESET(buf); \
+	} while(0)
+
+/* mac_parse - split string into literal text and macro references */
+
+int     mac_parse(const char *value, MAC_PARSE_FN action, void *context)
+{
+    const char *myname = "mac_parse";
+    VSTRING *buf = vstring_alloc(1);	/* result buffer */
+    const char *vp;			/* value pointer */
+    const char *pp;			/* open_paren pointer */
+    const char *ep;			/* string end pointer */
+    static char open_paren[] = "({";
+    static char close_paren[] = ")}";
+    int     level;
+    int     status = 0;
+
+#define SKIP(start, var, cond) do { \
+        for (var = start; *var && (cond); var++) \
+	    /* void */; \
+    } while (0)
+
+    if (msg_verbose > 1)
+	msg_info("%s: %s", myname, value);
+
+    for (vp = value; *vp;) {
+	if (*vp != '$') {			/* ordinary character */
+	    VSTRING_ADDCH(buf, *vp);
+	    vp += 1;
+	} else if (vp[1] == '$') {		/* $$ becomes $ */
+	    VSTRING_ADDCH(buf, *vp);
+	    vp += 2;
+	} else {				/* found bare $ */
+	    if (VSTRING_LEN(buf) > 0)
+		MAC_PARSE_ACTION(status, MAC_PARSE_LITERAL, buf, context);
+	    vp += 1;
+	    pp = open_paren;
+	    if (*vp == *pp || *vp == *++pp) {	/* ${x} or $(x) */
+		level = 1;
+		vp += 1;
+		for (ep = vp; level > 0; ep++) {
+		    if (*ep == 0) {
+			msg_warn("truncated macro reference: \"%s\"", value);
+			status |= MAC_PARSE_ERROR;
+			break;
+		    }
+		    if (*ep == *pp)
+			level++;
+		    if (*ep == close_paren[pp - open_paren])
+			level--;
+		}
+		if (status & MAC_PARSE_ERROR)
+		    break;
+		vstring_strncat(buf, vp, level > 0 ? ep - vp : ep - vp - 1);
+		vp = ep;
+	    } else {				/* plain $x */
+		SKIP(vp, ep, ISALNUM(*ep) || *ep == '_');
+		vstring_strncat(buf, vp, ep - vp);
+		vp = ep;
+	    }
+	    if (VSTRING_LEN(buf) == 0) {
+		status |= MAC_PARSE_ERROR;
+		msg_warn("empty macro name: \"%s\"", value);
+		break;
+	    }
+	    MAC_PARSE_ACTION(status, MAC_PARSE_EXPR, buf, context);
+	}
+    }
+    if (VSTRING_LEN(buf) > 0 && (status & MAC_PARSE_ERROR) == 0)
+	MAC_PARSE_ACTION(status, MAC_PARSE_LITERAL, buf, context);
+
+    /*
+     * Cleanup.
+     */
+    vstring_free(buf);
+
+    return (status);
+}
+
+#ifdef TEST
+
+ /*
+  * Proof-of-concept test program. Read strings from stdin, print parsed
+  * result to stdout.
+  */
+#include <vstring_vstream.h>
+
+/* mac_parse_print - print parse tree */
+
+static int mac_parse_print(int type, VSTRING *buf, void *unused_context)
+{
+    char   *type_name;
+
+    switch (type) {
+    case MAC_PARSE_EXPR:
+	type_name = "MAC_PARSE_EXPR";
+	break;
+    case MAC_PARSE_LITERAL:
+	type_name = "MAC_PARSE_LITERAL";
+	break;
+    default:
+	msg_panic("unknown token type %d", type);
+    }
+    vstream_printf("%s \"%s\"\n", type_name, vstring_str(buf));
+    return (0);
+}
+
+int     main(int unused_argc, char **unused_argv)
+{
+    VSTRING *buf = vstring_alloc(1);
+
+    while (vstring_fgets_nonl(buf, VSTREAM_IN)) {
+	mac_parse(vstring_str(buf), mac_parse_print, (void *) 0);
+	vstream_fflush(VSTREAM_OUT);
+    }
+    vstring_free(buf);
+    return (0);
+}
+
+#endif