indent: Avoid using values of pointers that refer to deallocated space.

For now maintain the local style in this file.

Reviewed by:	jilles

Reference:
https://github.com/pstef/freebsd_indent/commit/9099a9f17bc5f579514a4c11111f5cf3df6624c6

Differential Revision: https://reviews.freebsd.org/D6966  (Partial)
Submitted by:	Piotr Stefaniak

1 files changed, 10 insertions, 5 deletions

diff --git a/usr.bin/indent/indent_globs.h b/usr.bin/indent/indent_globs.h
index 78873c0e9004..3f8e17cb9186 100644
--- a/usr.bin/indent/indent_globs.h
+++ b/usr.bin/indent/indent_globs.h
@@ -57,41 +57,46 @@ FILE       *output;		/* the output file */
 #define CHECK_SIZE_CODE \
 	if (e_code >= l_code) { \
 	    int nsize = l_code-s_code+400; \
+	    int code_len = e_code-s_code; \
 	    codebuf = (char *) realloc(codebuf, nsize); \
 	    if (codebuf == NULL) \
 		err(1, NULL); \
-	    e_code = codebuf + (e_code-s_code) + 1; \
+	    e_code = codebuf + code_len + 1; \
 	    l_code = codebuf + nsize - 5; \
 	    s_code = codebuf + 1; \
 	}
 #define CHECK_SIZE_COM \
 	if (e_com >= l_com) { \
 	    int nsize = l_com-s_com+400; \
+	    int com_len = e_com - s_com; \
+	    int blank_pos = last_bl - s_com; \
 	    combuf = (char *) realloc(combuf, nsize); \
 	    if (combuf == NULL) \
 		err(1, NULL); \
-	    e_com = combuf + (e_com-s_com) + 1; \
-	    last_bl = combuf + (last_bl-s_com) + 1; \
+	    e_com = combuf + com_len + 1; \
+	    last_bl = combuf + blank_pos + 1; \
 	    l_com = combuf + nsize - 5; \
 	    s_com = combuf + 1; \
 	}
 #define CHECK_SIZE_LAB \
 	if (e_lab >= l_lab) { \
 	    int nsize = l_lab-s_lab+400; \
+	    int label_len = e_lab - s_lab; \
 	    labbuf = (char *) realloc(labbuf, nsize); \
 	    if (labbuf == NULL) \
 		err(1, NULL); \
-	    e_lab = labbuf + (e_lab-s_lab) + 1; \
+	    e_lab = labbuf + label_len + 1; \
 	    l_lab = labbuf + nsize - 5; \
 	    s_lab = labbuf + 1; \
 	}
 #define CHECK_SIZE_TOKEN \
 	if (e_token >= l_token) { \
 	    int nsize = l_token-s_token+400; \
+	    int token_len = e_token - s_token; \
 	    tokenbuf = (char *) realloc(tokenbuf, nsize); \
 	    if (tokenbuf == NULL) \
 		err(1, NULL); \
-	    e_token = tokenbuf + (e_token-s_token) + 1; \
+	    e_token = tokenbuf + token_len + 1; \
 	    l_token = tokenbuf + nsize - 5; \
 	    s_token = tokenbuf + 1; \
 	}