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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/3] libxl: config parser: make CfgParseContext initialisation common
xlu_cfg_readfile and xlu_cfg_readdata had some somewhat-boilerplate
code for initialisation, parsing, and cleanup. Make that common.
No functional change.
Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
tools/libxl/libxlu_cfg.c | 82 ++++++++++++++++++++++++--------------------
tools/libxl/libxlu_cfg_l.c | 30 ++++++++++++----
tools/libxl/libxlu_cfg_l.h | 18 ++++++++-
3 files changed, 83 insertions(+), 47 deletions(-)
diff --git a/tools/libxl/libxlu_cfg.c b/tools/libxl/libxlu_cfg.c
index 1ade7ea..821b8c0 100644
--- a/tools/libxl/libxlu_cfg.c
+++ b/tools/libxl/libxlu_cfg.c
@@ -18,59 +18,68 @@ XLU_Config *xlu_cfg_init(FILE *report, const char
*report_filename) {
return cfg;
}
+static int ctx_prep(CfgParseContext *ctx, XLU_Config *cfg) {
+ int e;
+
+ ctx->cfg= cfg;
+ ctx->err= 0;
+ ctx->lexerrlineno= -1;
+ ctx->scanner= 0;
+
+ e= xlu__cfg_yylex_init_extra(ctx, &ctx->scanner);
+ if (e) {
+ fprintf(cfg->report,"%s: unable to create scanner: %s\n",
+ cfg->filename, strerror(e));
+ return e;
+ }
+ return 0;
+}
+
+static void ctx_dispose(CfgParseContext *ctx) {
+ if (ctx->scanner) xlu__cfg_yylex_destroy(ctx->scanner);
+}
+
+static void parse(CfgParseContext *ctx) {
+ /* On return, ctx.err will be updated with the error status. */
+ int r;
+ r= xlu__cfg_yyparse(ctx);
+ if (r) assert(ctx->err);
+}
+
int xlu_cfg_readfile(XLU_Config *cfg, const char *real_filename) {
+ FILE *f = 0;
+ int e;
+
CfgParseContext ctx;
- FILE *f;
- int e, r;
+ e = ctx_prep(&ctx, cfg);
+ if (e) { ctx.err= e; goto xe; }
- ctx.cfg= cfg;
- ctx.err= 0;
- ctx.lexerrlineno= -1;
-
f= fopen(real_filename, "r");
if (!f) {
- e= errno;
+ ctx.err = errno;
fprintf(cfg->report,"%s: unable to open configuration file: %s\n",
real_filename, strerror(e));
- return e;
- }
-
- e= xlu__cfg_yylex_init_extra(&ctx, &ctx.scanner);
- if (e) {
- fprintf(cfg->report,"%s: unable to create scanner: %s\n",
- cfg->filename, strerror(e));
- return e;
+ goto xe;
}
xlu__cfg_yyrestart(f, ctx.scanner);
- r= xlu__cfg_yyparse(&ctx);
- if (r) assert(ctx.err);
+ parse(&ctx);
- xlu__cfg_yylex_destroy(ctx.scanner);
- fclose(f);
+ xe:
+ ctx_dispose(&ctx);
+ if (f) fclose(f);
return ctx.err;
}
int xlu_cfg_readdata(XLU_Config *cfg, const char *data, int length) {
- CfgParseContext ctx;
- int e, r;
+ int e;
YY_BUFFER_STATE buf= 0;
- ctx.scanner= 0;
- ctx.cfg= cfg;
- ctx.err= 0;
- ctx.lexerrlineno= -1;
-
- e= xlu__cfg_yylex_init_extra(&ctx, &ctx.scanner);
- if (e) {
- fprintf(cfg->report,"%s: unable to create scanner: %s\n",
- cfg->filename, strerror(e));
- ctx.err= e;
- ctx.scanner= 0;
- goto xe;
- }
+ CfgParseContext ctx;
+ e= ctx_prep(&ctx, cfg);
+ if (e) { ctx.err= e; goto xe; }
buf = xlu__cfg_yy_scan_bytes(data, length, ctx.scanner);
if (!buf) {
@@ -80,12 +89,11 @@ int xlu_cfg_readdata(XLU_Config *cfg, const char *data, int
length) {
goto xe;
}
- r= xlu__cfg_yyparse(&ctx);
- if (r) assert(ctx.err);
+ parse(&ctx);
xe:
if (buf) xlu__cfg_yy_delete_buffer(buf, ctx.scanner);
- if (ctx.scanner) xlu__cfg_yylex_destroy(ctx.scanner);
+ ctx_dispose(&ctx);
return ctx.err;
}
diff --git a/tools/libxl/libxlu_cfg_l.c b/tools/libxl/libxlu_cfg_l.c
index e1078f1..917a156 100644
--- a/tools/libxl/libxlu_cfg_l.c
+++ b/tools/libxl/libxlu_cfg_l.c
@@ -54,7 +54,6 @@ typedef int flex_int32_t;
typedef unsigned char flex_uint8_t;
typedef unsigned short int flex_uint16_t;
typedef unsigned int flex_uint32_t;
-#endif /* ! C99 */
/* Limits of integral types. */
#ifndef INT8_MIN
@@ -85,6 +84,8 @@ typedef unsigned int flex_uint32_t;
#define UINT32_MAX (4294967295U)
#endif
+#endif /* ! C99 */
+
#endif /* ! FLEXINT_H */
#ifdef __cplusplus
@@ -158,7 +159,15 @@ typedef void* yyscan_t;
/* Size of default input buffer. */
#ifndef YY_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k.
+ * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
+ * Ditto for the __ia64__ case accordingly.
+ */
+#define YY_BUF_SIZE 32768
+#else
#define YY_BUF_SIZE 16384
+#endif /* __ia64__ */
#endif
/* The state buf must be large enough to hold one state per character in the
main buffer.
@@ -487,7 +496,7 @@ int xlu__cfg_yyget_column(yyscan_t yyscanner);
void xlu__cfg_yyset_column(int column_no, yyscan_t yyscanner);
-#line 491 "libxlu_cfg_l.c"
+#line 500 "libxlu_cfg_l.c"
#define INITIAL 0
#define lexerr 1
@@ -623,7 +632,12 @@ static int input (yyscan_t yyscanner );
/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k */
+#define YY_READ_BUF_SIZE 16384
+#else
#define YY_READ_BUF_SIZE 8192
+#endif /* __ia64__ */
#endif
/* Copy whatever the last rule matched to the standard output. */
@@ -631,7 +645,7 @@ static int input (yyscan_t yyscanner );
/* This used to be an fputs(), but since the string might contain NUL's,
* we now use fwrite().
*/
-#define ECHO fwrite( yytext, yyleng, 1, yyout )
+#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
#endif
/* Gets input and stuffs it into "buf". number of characters read, or YY_NULL,
@@ -642,7 +656,7 @@ static int input (yyscan_t yyscanner );
if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
{ \
int c = '*'; \
- int n; \
+ size_t n; \
for ( n = 0; n < max_size && \
(c = getc( yyin )) != EOF && c != '\n'; ++n ) \
buf[n] = (char) c; \
@@ -730,7 +744,7 @@ YY_DECL
#line 37 "libxlu_cfg_l.l"
-#line 734 "libxlu_cfg_l.c"
+#line 748 "libxlu_cfg_l.c"
yylval = yylval_param;
@@ -930,7 +944,7 @@ YY_RULE_SETUP
#line 82 "libxlu_cfg_l.l"
YY_FATAL_ERROR( "flex scanner jammed" );
YY_BREAK
-#line 934 "libxlu_cfg_l.c"
+#line 948 "libxlu_cfg_l.c"
case YY_STATE_EOF(INITIAL):
case YY_STATE_EOF(lexerr):
yyterminate();
@@ -1673,8 +1687,8 @@ YY_BUFFER_STATE xlu__cfg_yy_scan_string (yyconst char *
yystr , yyscan_t yyscann
/** Setup the input buffer state to scan the given bytes. The next call to
xlu__cfg_yylex() will
* scan from a @e copy of @a bytes.
- * @param bytes the byte buffer to scan
- * @param len the number of bytes in the buffer pointed to by @a bytes.
+ * @param yybytes the byte buffer to scan
+ * @param _yybytes_len the number of bytes in the buffer pointed to by @a
bytes.
* @param yyscanner The scanner object.
* @return the newly allocated buffer state object.
*/
diff --git a/tools/libxl/libxlu_cfg_l.h b/tools/libxl/libxlu_cfg_l.h
index 3dd1215..26f6dd6 100644
--- a/tools/libxl/libxlu_cfg_l.h
+++ b/tools/libxl/libxlu_cfg_l.h
@@ -58,7 +58,6 @@ typedef int flex_int32_t;
typedef unsigned char flex_uint8_t;
typedef unsigned short int flex_uint16_t;
typedef unsigned int flex_uint32_t;
-#endif /* ! C99 */
/* Limits of integral types. */
#ifndef INT8_MIN
@@ -89,6 +88,8 @@ typedef unsigned int flex_uint32_t;
#define UINT32_MAX (4294967295U)
#endif
+#endif /* ! C99 */
+
#endif /* ! FLEXINT_H */
#ifdef __cplusplus
@@ -131,7 +132,15 @@ typedef void* yyscan_t;
/* Size of default input buffer. */
#ifndef YY_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k.
+ * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
+ * Ditto for the __ia64__ case accordingly.
+ */
+#define YY_BUF_SIZE 32768
+#else
#define YY_BUF_SIZE 16384
+#endif /* __ia64__ */
#endif
#ifndef YY_TYPEDEF_YY_BUFFER_STATE
@@ -301,7 +310,12 @@ static int yy_flex_strlen (yyconst char * ,yyscan_t
yyscanner);
/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
+#ifdef __ia64__
+/* On IA-64, the buffer size is 16k, not 8k */
+#define YY_READ_BUF_SIZE 16384
+#else
#define YY_READ_BUF_SIZE 8192
+#endif /* __ia64__ */
#endif
/* Number of entries by which start-condition stack grows. */
@@ -338,6 +352,6 @@ extern int xlu__cfg_yylex \
#line 82 "libxlu_cfg_l.l"
-#line 342 "libxlu_cfg_l.h"
+#line 356 "libxlu_cfg_l.h"
#undef xlu__cfg_yyIN_HEADER
#endif /* xlu__cfg_yyHEADER_H */
--
1.5.6.5
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