upgrade ngmakeidx to support build in a sparate directory

ChangeLog

@@ -1,3 +1,8 @@
+2011-07-03  Robert Larice
+ * src/Makefile.am ,
+ * src/makeidx.c :
+   upgrade ngmakeidx to support build in a sparate directory
+
 2011-07-02  Robert Larice
  * src/main.c :
    main.c, a series of cleanups concerning SETJMP processing

src/Makefile.am

@@ -275,8 +275,8 @@ ngmakeidx_SOURCES = makeidx.c
 
 ## create index for online help:
 
-ngspice.idx: ngmakeidx$(EXEEXT)
-	./ngmakeidx$(EXEEXT) $(srcdir)/ngspice.txt
+ngspice.idx: ngmakeidx$(EXEEXT) $(srcdir)/ngspice.txt
+	./ngmakeidx$(EXEEXT) -o ngspice.idx $(srcdir)/ngspice.txt
 
 endif !WINDOWS
 

src/makeidx.c

@@ -13,46 +13,62 @@ Copyright 1990 Regents of the University of California.  All rights reserved.
 
 #define BSIZE_SP  512
 
-int
-main(int argc, char **argv)
-{
 
+static void
+makeidx(const char *dst, const char *src)
+{
     FILE *fp;
     FILE *wfp;
     char buf[BSIZE_SP];
     long fpos;
     char subject[BSIZE_SP];
     struct hlp_index indexitem;
-    char *pos;
 
+    if (!(fp = fopen(src, "r"))) {
+        perror(src);
+        return;
+    }
 
-    while (--argc) {
-      if (!(fp = fopen(argv[argc], "r"))) {
-        perror(argv[argc]);
-        continue;
-      }
-      strcpy(buf, argv[argc]);
-      if (((pos =strrchr(buf, '.')) == 0) ||
-            strcmp(pos, ".txt")) {
-        fprintf(stderr, "%s does not end in .txt\n", buf);
-        continue;
-      }
-      *++pos = 'i'; *++pos = 'd'; *++pos = 'x';
-      if (!(wfp = fopen(buf, "wb"))) {
-        perror(buf);
-        continue;
-      }
-      fpos = 0;
-      while (fgets(buf, sizeof(buf), fp)) {
+    if (!(wfp = fopen(dst, "wb"))) {
+        perror(dst);
+        return;
+    }
+
+    fpos = 0;
+    while (fgets(buf, sizeof(buf), fp)) {
         if (!strncmp(buf, "SUBJECT: ", 9)) {
-          strcpy(subject, &buf[9]);
-          subject[strlen(subject) - 1] = '\0';  /* get rid of '\n' */
-          strncpy(indexitem.subject, subject, 64);  /* zero out end */
-          indexitem.fpos = fpos;
-          fwrite(&indexitem, sizeof(struct hlp_index), 1, wfp);
+            strcpy(subject, &buf[9]);
+            subject[strlen(subject) - 1] = '\0';  /* get rid of '\n' */
+            strncpy(indexitem.subject, subject, 64);  /* zero out end */
+            indexitem.fpos = fpos;
+            fwrite(&indexitem, sizeof(struct hlp_index), 1, wfp);
         }
         fpos = ftell(fp);
-      }
     }
+}
+
+
+int
+main(int argc, char **argv)
+{
+    if(argc == 4 && !strcmp(argv[1], "-o")) {
+        makeidx(argv[2], argv[3]);
+        exit(0);
+    }
+
+    while (--argc) {
+
+        char buf[BSIZE_SP];
+        char *pos;
+
+        strcpy(buf, argv[argc]);
+        if (!(pos = strrchr(buf, '.')) || strcmp(pos, ".txt")) {
+            fprintf(stderr, "%s does not end in .txt\n", buf);
+            continue;
+        }
+        *++pos = 'i'; *++pos = 'd'; *++pos = 'x';
+        makeidx(buf, argv[argc]);
+    }
+
     exit(0);
 }