From 5d5d1bef6e32c7c622f123069059e0e9a473b536 Mon Sep 17 00:00:00 2001
From: Peter Stephenson <pws@users.sourceforge.net>
Date: Thu, 13 Dec 2007 20:52:52 +0000
Subject: 24234: apply typeset parameter flags consistently

---
 Src/params.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 124 insertions(+), 1 deletion(-)

(limited to 'Src/params.c')

diff --git a/Src/params.c b/Src/params.c
index 0fe1a6dd8..9ebb98dcf 100644
--- a/Src/params.c
+++ b/Src/params.c
@@ -1884,11 +1884,134 @@ getstrvalue(Value v)
 	s = v->pm->gsu.s->getfn(v->pm);
 	break;
     default:
-	s = NULL;
+	s = "";
 	DPUTS(1, "BUG: param node without valid type");
 	break;
     }
 
+    if (v->pm->node.flags & (PM_LEFT|PM_RIGHT_B|PM_RIGHT_Z)) {
+	int fwidth = v->pm->width ? v->pm->width : MB_METASTRLEN(s);
+	switch (v->pm->node.flags & (PM_LEFT | PM_RIGHT_B | PM_RIGHT_Z)) {
+	    char *t, *tend;
+	    unsigned int t0;
+
+	case PM_LEFT:
+	case PM_LEFT | PM_RIGHT_Z:
+	    t = s;
+	    if (v->pm->node.flags & PM_RIGHT_Z)
+		while (*t == '0')
+		    t++;
+	    else
+		while (iblank(*t))
+		    t++;
+	    MB_METACHARINIT();
+	    for (tend = t, t0 = 0; t0 < fwidth && *tend; t0++)
+		tend += MB_METACHARLEN(tend);
+	    /*
+	     * t0 is the number of characters from t used,
+	     * hence (fwidth - t0) is the number of padding
+	     * characters.  fwidth is a misnomer: we use
+	     * character counts, not character widths.
+	     *
+	     * (tend - t) is the number of bytes we need
+	     * to get fwidth characters or the entire string;
+	     * the characters may be multiple bytes.
+	     */
+	    fwidth -= t0; /* padding chars remaining */
+	    t0 = tend - t; /* bytes to copy from string */
+	    s = (char *) hcalloc(t0 + fwidth + 1);
+	    memcpy(s, t, t0);
+	    if (fwidth)
+		memset(s + t0, ' ', fwidth);
+	    s[t0 + fwidth] = '\0';
+	    break;
+	case PM_RIGHT_B:
+	case PM_RIGHT_Z:
+	case PM_RIGHT_Z | PM_RIGHT_B:
+	    {
+		int zero = 1;
+		/* Calculate length in possibly multibyte chars */
+		unsigned int charlen = MB_METASTRLEN(s);
+
+		if (charlen < fwidth) {
+		    char *valprefend = s;
+		    int preflen;
+		    if (v->pm->node.flags & PM_RIGHT_Z) {
+			/*
+			 * This is a documented feature: when deciding
+			 * whether to pad with zeroes, ignore
+			 * leading blanks already in the value;
+			 * only look for numbers after that.
+			 * Not sure how useful this really is.
+			 * It's certainly confusing to code around.
+			 */
+			for (t = s; iblank(*t); t++)
+			    ;
+			/*
+			 * Allow padding after initial minus
+			 * for numeric variables.
+			 */
+			if ((v->pm->node.flags &
+			     (PM_INTEGER|PM_EFLOAT|PM_FFLOAT)) &&
+			    *t == '-')
+			    t++;
+			/*
+			 * Allow padding after initial 0x or
+			 * base# for integer variables.
+			 */
+			if (v->pm->node.flags & PM_INTEGER) {
+			    if (isset(CBASES) &&
+				t[0] == '0' && t[1] == 'x')
+				t += 2;
+			    else if ((valprefend = strchr(t, '#')))
+				t = valprefend + 1;
+			}
+			valprefend = t;
+			if (!*t)
+			    zero = 0;
+			else if (v->pm->node.flags &
+				 (PM_INTEGER|PM_EFLOAT|PM_FFLOAT)) {
+			    /* zero always OK */
+			} else if (!idigit(*t))
+			    zero = 0;
+		    }
+		    /* number of characters needed for padding */
+		    fwidth -= charlen;
+		    /* bytes from original string */
+		    t0 = strlen(s);
+		    t = (char *) hcalloc(fwidth + t0 + 1);
+		    /* prefix guaranteed to be single byte chars */
+		    preflen = valprefend - s;
+		    memset(t + preflen, 
+			   (((v->pm->node.flags & PM_RIGHT_B)
+			     || !zero) ?       ' ' : '0'), fwidth);
+		    /*
+		     * Copy - or 0x or base# before any padding
+		     * zeroes.
+		     */
+		    if (preflen)
+			memcpy(t, s, preflen);
+		    memcpy(t + preflen + fwidth,
+			   valprefend, t0 - preflen);
+		    t[fwidth + t0] = '\0';
+		    s = t;
+		} else {
+		    /* Need to skip (charlen - fwidth) chars */
+		    for (t0 = charlen - fwidth; t0; t0--)
+			s += MB_METACHARLEN(s);
+		}
+	    }
+	    break;
+	}
+    }
+    switch (v->pm->node.flags & (PM_LOWER | PM_UPPER)) {
+    case PM_LOWER:
+	s = casemodify(s, CASMOD_LOWER);
+	break;
+    case PM_UPPER:
+	s = casemodify(s, CASMOD_UPPER);
+	break;
+    }
     if (v->start == 0 && v->end == -1)
 	return s;
 
-- 
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