fix of the zlib error handling

kunschikov · kunschikov · commit 15e9fda6df51 · 2017-04-05T15:22:21.000+03:00
diff --git a/src/bin/pg_dump/compress_io.c b/src/bin/pg_dump/compress_io.c
@@ -593,7 +593,7 @@ cfread(void *ptr, int size, cfp *fp)
 		ret = gzread(fp->compressedfp, ptr, size);
 		if (ret != size && !gzeof(fp->compressedfp))
 			exit_horribly(modulename,
-					"could not read from input file: %s\n", strerror(errno));
+					"could not read from input file: %s\n", get_gz_error(fp->compressedfp));
 	}
 	else
 #endif
@@ -629,7 +629,7 @@ cfgetc(cfp *fp)
 		{
 			if (!gzeof(fp->compressedfp))
 				exit_horribly(modulename,
-					"could not read from input file: %s\n", strerror(errno));
+					"could not read from input file: %s\n", get_gz_error(fp->compressedfp));
 			else
 				exit_horribly(modulename,
 							"could not read from input file: end of file\n");
@@ -710,4 +710,16 @@ hasSuffix(const char *filename, const char *suffix)
 				  suffixlen) == 0;
 }
 
+const char *
+get_gz_error(gzFile gzf)
+{
+	int			errnum;
+	const char *errmsg;
+
+	errmsg = gzerror(gzf, &errnum);
+	if (errnum == Z_ERRNO)
+		return strerror(errno);
+	else
+		return errmsg;
+}
 #endif
diff --git a/src/bin/pg_dump/compress_io.h b/src/bin/pg_dump/compress_io.h
@@ -52,6 +52,7 @@ extern void ReadDataFromArchive(ArchiveHandle *AH, int compression,
 extern void WriteDataToArchive(ArchiveHandle *AH, CompressorState *cs,
 				   const void *data, size_t dLen);
 extern void EndCompressor(ArchiveHandle *AH, CompressorState *cs);
+extern const char * get_gz_error(gzFile gzf);
 
 
 typedef struct cfp cfp;
diff --git a/src/bin/pg_dump/pg_backup_tar.c b/src/bin/pg_dump/pg_backup_tar.c
@@ -35,6 +35,7 @@
 #include "pgtar.h"
 #include "common/file_utils.h"
 #include "fe_utils/string_utils.h"
+#include "compress_io.h"
 
 #include <sys/stat.h>
 #include <ctype.h>
@@ -556,7 +557,7 @@ _tarReadRaw(ArchiveHandle *AH, void *buf, size_t len, TAR_MEMBER *th, FILE *fh)
 				res = GZREAD(&((char *) buf)[used], 1, len, th->zFH);
 				if (res != len && !GZEOF(th->zFH))
 					exit_horribly(modulename,
-					"could not read from input file: %s\n", strerror(errno));
+					"could not read from input file: %s\n", get_gz_error(th->zFH));
 			}
 			else
 			{
