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-rw-r--r--ChangeLog1
-rw-r--r--src/bltin/printf.c80
-rw-r--r--src/output.c82
-rw-r--r--src/output.h3
4 files changed, 119 insertions, 47 deletions
diff --git a/ChangeLog b/ChangeLog
index 46ef4c2..379672f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,7 @@
 2014-10-27  Herbert Xu <herbert@gondor.apana.org.au>
 
 	* Add printf support for format string a, A, and F.
+	* Handle embedded NULs correctly in printf.
 
 2014-10-13  Eric Blake <eblake@redhat.com>
 
diff --git a/src/bltin/printf.c b/src/bltin/printf.c
index e0ef912..213025f 100644
--- a/src/bltin/printf.c
+++ b/src/bltin/printf.c
@@ -40,7 +40,7 @@
 #include <string.h>
 #include <unistd.h>
 
-static int	 conv_escape_str(char *);
+static int	 conv_escape_str(char *, char **);
 static char	*conv_escape(char *, int *);
 static int	 getchr(void);
 static double	 getdouble(void);
@@ -73,6 +73,53 @@ static char  **gargv;
 	} \
 }
 
+#define ASPF(sp, f, func) ({ \
+	int ret; \
+	switch ((char *)param - (char *)array) { \
+	default: \
+		ret = xasprintf(sp, f, array[0], array[1], func); \
+		break; \
+	case sizeof(*param): \
+		ret = xasprintf(sp, f, array[0], func); \
+		break; \
+	case 0: \
+		ret = xasprintf(sp, f, func); \
+		break; \
+	} \
+	ret; \
+})
+
+
+static int print_escape_str(const char *f, int *param, int *array, char *s)
+{
+	struct stackmark smark;
+	char *p, *q;
+	int done;
+	int len;
+	int total;
+
+	setstackmark(&smark);
+	done = conv_escape_str(s, &p);
+	q = stackblock();
+	len = p - q;
+
+	p = makestrspace(len, p);
+	memset(p, 'X', len - 1);
+	p[len - 1] = 0;
+
+	q = stackblock();
+	total = ASPF(&p, f, p);
+
+	len = strchrnul(p, 'X') - p;
+	memcpy(p + len, q, strchrnul(p + len, ' ') - (p + len));
+
+	out1mem(p, total);
+
+	popstackmark(&smark);
+	return done;
+}
+
+
 int printfcmd(int argc, char *argv[])
 {
 	char *fmt;
@@ -154,17 +201,14 @@ pc:
 			fmt[1] = 0;
 			switch (ch) {
 
-			case 'b': {
-				int done = conv_escape_str(getstr());
-				char *p = stackblock();
+			case 'b':
 				*fmt = 's';
-				PF(start, p);
 				/* escape if a \c was encountered */
-				if (done)
+				if (print_escape_str(start, param, array,
+						     getstr()))
 					goto out;
 				*fmt = 'b';
 				break;
-			}
 			case 'c': {
 				int p = getchr();
 				PF(start, p);
@@ -223,8 +267,9 @@ err:
  *	Halts processing string if a \c escape is encountered.
  */
 static int
-conv_escape_str(char *str)
+conv_escape_str(char *str, char **sp)
 {
+	int c;
 	int ch;
 	char *cp;
 
@@ -232,16 +277,14 @@ conv_escape_str(char *str)
 	STARTSTACKSTR(cp);
 
 	do {
-		int c;
-
-		ch = *str++;
+		c = ch = *str++;
 		if (ch != '\\')
 			continue;
 
 		ch = *str++;
 		if (ch == 'c') {
 			/* \c as in SYSV echo - abort all processing.... */
-			ch = 0x100;
+			c = ch = 0x100;
 			continue;
 		}
 
@@ -253,14 +296,14 @@ conv_escape_str(char *str)
 		if (ch == '0') {
 			unsigned char i;
 			i = 3;
-			ch = 0;
+			c = 0;
 			do {
 				unsigned k = octtobin(*str);
 				if (k > 7)
 					break;
 				str++;
-				ch <<= 3;
-				ch += k;
+				c <<= 3;
+				c += k;
 			} while (--i);
 			continue;
 		}
@@ -268,7 +311,9 @@ conv_escape_str(char *str)
 		/* Finally test for sequences valid in the format string */
 		str = conv_escape(str - 1, &c);
 		ch = c;
-	} while (STPUTC(ch, cp), (char)ch);
+	} while (STPUTC(c, cp), (char)ch);
+
+	*sp = cp;
 
 	return ch;
 }
@@ -456,8 +501,7 @@ echocmd(int argc, char **argv)
 	do {
 		int c;
 
-		nonl += conv_escape_str(*argv);
-		outstr(stackblock(), outs);
+		nonl += print_escape_str("%s", NULL, NULL, *argv);
 		if (nonl > 0)
 			break;
 
diff --git a/src/output.c b/src/output.c
index f62e7ea..1b20850 100644
--- a/src/output.c
+++ b/src/output.c
@@ -99,9 +99,6 @@ struct output *out1 = &output;
 struct output *out2 = &errout;
 
 
-#ifndef USE_GLIBC_STDIO
-static void __outstr(const char *, size_t, struct output *);
-#endif
 static int xvsnprintf(char *, size_t, const char *, va_list);
 
 
@@ -134,10 +131,14 @@ RESET {
 #endif
 
 
-#ifndef USE_GLIBC_STDIO
-static void
-__outstr(const char *p, size_t len, struct output *dest)
+void
+outmem(const char *p, size_t len, struct output *dest)
 {
+#ifdef USE_GLIBC_STDIO
+	INTOFF;
+	fwrite(p, 1, len, dest->stream);
+	INTON;
+#else
 	size_t bufsize;
 	size_t offset;
 	size_t nleft;
@@ -186,8 +187,8 @@ alloc:
 err:
 		dest->flags |= OUTPUT_ERR;
 	}
-}
 #endif
+}
 
 
 void
@@ -201,7 +202,7 @@ outstr(const char *p, struct output *file)
 	size_t len;
 
 	len = strlen(p);
-	__outstr(p, len, file);
+	outmem(p, len, file);
 #endif
 }
 
@@ -213,7 +214,7 @@ void
 outcslow(int c, struct output *dest)
 {
 	char buf = c;
-	__outstr(&buf, 1, dest);
+	outmem(&buf, 1, dest);
 }
 #endif
 
@@ -283,35 +284,58 @@ fmtstr(char *outbuf, size_t length, const char *fmt, ...)
 }
 
 
+static int xvasprintf(char **sp, size_t size, const char *f, va_list ap)
+{
+	char *s;
+	int len;
+	va_list ap2;
+
+	va_copy(ap2, ap);
+	len = xvsnprintf(*sp, size, f, ap2);
+	va_end(ap2);
+	if (len < 0)
+		sh_error("xvsnprintf failed");
+	if (len < size)
+		return len;
+
+	s = stalloc((len >= stackblocksize() ? len : stackblocksize()) + 1);
+	*sp = s;
+	len = xvsnprintf(s, len + 1, f, ap);
+	return len;
+}
+
+
+int xasprintf(char **sp, const char *f, ...)
+{
+	va_list ap;
+	int ret;
+
+	va_start(ap, f);
+	ret = xvasprintf(sp, 0, f, ap);
+	va_end(ap);
+	return ret;
+}
+
+
 #ifndef USE_GLIBC_STDIO
 void
 doformat(struct output *dest, const char *f, va_list ap)
 {
 	struct stackmark smark;
 	char *s;
-	int len, ret;
-	size_t size;
-	va_list ap2;
+	int len;
+	int olen;
 
-	va_copy(ap2, ap);
-	size = dest->end - dest->nextc;
-	len = xvsnprintf(dest->nextc, size, f, ap2);
-	va_end(ap2);
-	if (len < 0) {
-		dest->flags |= OUTPUT_ERR;
-		return;
-	}
-	if (len < size) {
+	setstackmark(&smark);
+	s = dest->nextc;
+	olen = dest->end - dest->nextc;
+	len = xvasprintf(&s, olen, f, ap);
+	if (likely(olen > len)) {
 		dest->nextc += len;
-		return;
+		goto out;
 	}
-	setstackmark(&smark);
-	s = stalloc((len >= stackblocksize() ? len : stackblocksize()) + 1);
-	ret = xvsnprintf(s, len + 1, f, ap);
-	if (ret == len)
-		__outstr(s, len, dest);
-	else
-		dest->flags |= OUTPUT_ERR;
+	outmem(s, len, dest);
+out:
 	popstackmark(&smark);
 }
 #endif
diff --git a/src/output.h b/src/output.h
index f853e9d..c43d493 100644
--- a/src/output.h
+++ b/src/output.h
@@ -63,6 +63,7 @@ extern struct output memout;
 extern struct output *out1;
 extern struct output *out2;
 
+void outmem(const char *, size_t, struct output *);
 void outstr(const char *, struct output *);
 #ifndef USE_GLIBC_STDIO
 void outcslow(int, struct output *);
@@ -75,6 +76,7 @@ void out1fmt(const char *, ...)
     __attribute__((__format__(__printf__,1,2)));
 int fmtstr(char *, size_t, const char *, ...)
     __attribute__((__format__(__printf__,3,4)));
+int xasprintf(char **, const char *, ...);
 #ifndef USE_GLIBC_STDIO
 void doformat(struct output *, const char *, va_list);
 #endif
@@ -115,6 +117,7 @@ static inline void outc(int ch, struct output *file)
 #endif
 #define out1c(c)	outc((c), out1)
 #define out2c(c)	outcslow((c), out2)
+#define out1mem(s, l)	outmem((s), (l), out1)
 #define out1str(s)	outstr((s), out1)
 #define out2str(s)	outstr((s), out2)
 #define outerr(f)	(f)->flags