More savebuf/savestr error handling

* bootstrap.conf: use xmemdup0 module.
* src/pch.c (there_is_another_patch): Use xmemdup0 instead of savebuf when we
cannot recover from out-of-memory situations.
(intuit_diff_type): Likewise, use xstrdup instead of savestr.
(another_hunk): Handle the case when savestr returns NULL.
* src/util.c (fetchname, parse_name): Use xmemdup0 instead of savebuf when we
cannot recover from out-of-memory situations.

Bugs pointed out by Tobias Stoeckmann <tobias@stoeckmann.org>.

3 files changed, 13 insertions, 10 deletions

diff --git a/bootstrap.conf b/bootstrap.conf
index 7649539..d6074b3 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -69,6 +69,7 @@ utimens
 verror
 xalloc
 xlist
+xmemdup0
 "
 
 gnulib_tool_option_extras='--symlink --makefile-name=gnulib.mk'
diff --git a/src/pch.c b/src/pch.c
index aab17aa..abfe87a 100644
--- a/src/pch.c
+++ b/src/pch.c
@@ -25,6 +25,7 @@
 #include <quotearg.h>
 #include <util.h>
 #include <xalloc.h>
+#include <xmemdup0.h>
 #undef XTERN
 #define XTERN
 #include <pch.h>
@@ -291,8 +292,7 @@ there_is_another_patch (bool need_header, mode_t *file_type)
 	t = buf + strlen (buf);
 	if (t > buf + 1 && *(t - 1) == '\n')
 	  {
-	    inname = savebuf (buf, t - buf);
-	    inname[t - buf - 1] = 0;
+	    inname = xmemdup0 (buf, t - buf - 1);
 	    inerrno = stat_file (inname, &instat);
 	    if (inerrno)
 	      {
@@ -623,7 +623,7 @@ intuit_diff_type (bool need_header, mode_t *p_file_type)
 	    else {
 		char oldc = *t;
 		*t = '\0';
-		revision = savestr (revision);
+		revision = xstrdup (revision);
 		*t = oldc;
 	    }
 	  }
@@ -1015,7 +1015,7 @@ intuit_diff_type (bool need_header, mode_t *p_file_type)
       }
     else
       {
-	inname = savestr(p_name[i]);
+	inname = xstrdup (p_name[i]);
 	inerrno = stat_errno[i];
 	invc = version_controlled[i];
 	instat = st[i];
@@ -1255,6 +1255,8 @@ another_hunk (enum diff difftype, bool rev)
 		s++;
 	    *s = '\0';
 	    p_c_function = savestr (p_c_function);
+	    if (! p_c_function)
+	      return -1;
 	  }
 	p_hunk_beg = p_input_line + 1;
 	while (p_end < p_max) {
@@ -1658,6 +1660,8 @@ another_hunk (enum diff difftype, bool rev)
 		s++;
 	    *s = '\0';
 	    p_c_function = savestr (p_c_function);
+	    if (! p_c_function)
+	      return -1;
 	  }
 	if (!p_ptrn_lines)
 	    p_first++;			/* do append rather than insert */
diff --git a/src/util.c b/src/util.c
index 0af6013..66ae90f 100644
--- a/src/util.c
+++ b/src/util.c
@@ -27,6 +27,7 @@
 #define XTERN
 #include <util.h>
 #include <xalloc.h>
+#include <xmemdup0.h>
 
 #include <getdate.h>
 #include "ignore-value.h"
@@ -1476,8 +1477,7 @@ fetchname (char const *at, int strip_leading, char **pname,
 		break;
 	      }
 	  }
-	name = savebuf (at, t - at + 1);
-	name[t - at] = 0;
+	name = xmemdup0 (at, t - at);
       }
 
     /* If the name is "/dev/null", ignore the name and mark the file
@@ -1509,8 +1509,7 @@ fetchname (char const *at, int strip_leading, char **pname,
 	  u--;
 	if (u != t && *(u-1) == '\r')
 	  u--;
-	timestr = savebuf (t, u - t + 1);
-	timestr[u - t] = 0;
+	timestr = xmemdup0 (t, u - t);
       }
 
       if (*t != '\n')
@@ -1568,8 +1567,7 @@ parse_name (char const *s, int strip_leading, char const **endp)
 
       for (t = s; *t && ! ISSPACE ((unsigned char) *t); t++)
 	/* do nothing*/ ;
-      ret = savebuf (s, t - s + 1);
-      ret[t - s] = 0;
+      ret = xmemdup0 (s, t - s);
       if (endp)
 	*endp = t;
     }