Infrastructure: Split the files into subdirectories.

[mLib] / trace / traceopt.c

diff --git a/trace/traceopt.c b/trace/traceopt.c
new file mode 100644 (file)
index 0000000..78d82bd
--- /dev/null
+++ b/trace/traceopt.c
@@ -0,0 +1,105 @@
+/* -*-c-*-
+ *
+ * Parsing tracing options
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "report.h"
+#include "trace.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @traceopt@ --- *
+ *
+ * Arguments:  @const trace_opt *t@ = pointer to trace options table
+ *             @const char *p@ = option string supplied by user
+ *             @unsigned f@ = initial tracing flags
+ *             @unsigned bad@ = forbidden tracing flags
+ *
+ * Returns:    Trace flags as set by user.
+ *
+ * Use:                Parses an option string from the user and sets the
+ *             appropriate trace flags.  If the argument is null or a single
+ *             `?' character, a help message is displayed.
+ */
+
+unsigned traceopt(const trace_opt *t, const char *p,
+                 unsigned f, unsigned bad)
+{
+  unsigned sense = 1;
+
+  /* --- Dump out help text --- */
+
+  if (!p || !strcmp(p, "?")) {
+    const trace_opt *tt;
+    puts("Trace options:");
+    for (tt = t; tt->ch; tt++) {
+      if (!(tt->f & ~bad) || !tt->help)
+       continue;
+      printf(" `%c': %s\n", tt->ch, tt->help);
+    }
+    return (f);
+  }
+
+  /* --- Parse the string properly --- */
+
+  f = 0;
+  while (*p) {
+    switch (*p) {
+      case '+':
+       sense = 1;
+       break;
+      case '-':
+       sense = 0;
+       break;
+      default: {
+       const trace_opt *tt;
+       for (tt = t; tt->ch; tt++) {
+         if (!(tt->f & ~bad))
+           continue;
+         if (tt->ch == *p) {
+           if (sense)
+             f |= (tt->f & ~bad);
+           else
+             f &= ~(tt->f & ~bad);
+           goto ok;
+         }
+       }
+       moan("unknown trace option `%c'", *p);
+      ok:;
+      } break;
+    }
+    p++;
+  }
+
+  return (f);
+}
+
+/*----- That's all, folks -------------------------------------------------*/