[lttng-dev] [RFC PATCH 1/2] Resurrect LTT type parser
Jan Glauber
jan.glauber at gmail.com
Fri Apr 19 06:20:29 EDT 2013
Parse legacy LTT trace type format strings.
Resurrected from lttng-ust (serialize.c) git commit id: 31607b3
and slightly adopted to be useable by babeltrace-legacy.
Signed-off-by: Jan Glauber <jan.glauber at gmail.com>
---
converter/ltt-type-parser.c | 303 ++++++++++++++++++++++++++++++++++
include/babeltrace/ltt-type-parser.h | 17 ++
2 files changed, 320 insertions(+)
create mode 100644 converter/ltt-type-parser.c
create mode 100644 include/babeltrace/ltt-type-parser.h
diff --git a/converter/ltt-type-parser.c b/converter/ltt-type-parser.c
new file mode 100644
index 0000000..4290ee1
--- /dev/null
+++ b/converter/ltt-type-parser.c
@@ -0,0 +1,303 @@
+/*
+ * ltt-type-parser.c
+ *
+ * Parse legacy LTT trace type format strings.
+ * Resurrected from lttng-ust (serialize.c) git commit id: 31607b3
+ * and slightly adopted to be useable by babeltrace-legacy.
+ *
+ * Copyright Mathieu Desnoyers, March 2007.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#include "babeltrace/ltt-type-parser.h"
+
+/*
+ * Restrictions:
+ * Field width and precision are *not* supported.
+ * %n not supported.
+ */
+static const char *parse_c_type(const char *fmt, char *c_size,
+ enum ltt_type *c_type, char *base,
+ char *outfmt, int arch_size,
+ int size_long, int size_size_t)
+{
+ int qualifier;
+
+ /* process flags : ignore standard print formats for now. */
+repeat:
+ switch (*fmt) {
+ case '-':
+ case '+':
+ case ' ':
+ case '#':
+ case '0':
+ ++fmt;
+ goto repeat;
+ }
+
+ /* get the conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
+ *fmt == 'Z' || *fmt == 'z' || *fmt == 't' ||
+ *fmt == 'S') {
+ qualifier = *fmt;
+ ++fmt;
+ if (qualifier == 'l' && *fmt == 'l') {
+ qualifier = 'L';
+ ++fmt;
+ }
+ }
+
+ if (outfmt) {
+ if (qualifier != -1)
+ *outfmt++ = (char)qualifier;
+ *outfmt++ = *fmt;
+ *outfmt = 0;
+ }
+
+ switch (*fmt) {
+ case 'c':
+ *base = 10;
+ *c_type = LTT_TYPE_UNSIGNED_INT;
+ *c_size = sizeof(unsigned char);
+ goto parse_end;
+ case 's':
+ *c_type = LTT_TYPE_STRING;
+ goto parse_end;
+ case 'p':
+ *base = 16;
+ *c_type = LTT_TYPE_UNSIGNED_INT;
+ *c_size = arch_size;
+ goto parse_end;
+ case 'd':
+ case 'i':
+ *base = 10;
+ *c_type = LTT_TYPE_SIGNED_INT;
+ break;
+ case 'o':
+ *base = 8;
+ *c_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ case 'u':
+ *base = 10;
+ *c_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ case 'x':
+ case 'X':
+ *base = 16;
+ *c_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ default:
+ if (!*fmt)
+ --fmt;
+ goto parse_end;
+ }
+ switch (qualifier) {
+ case 'L':
+ *c_size = sizeof(long long);
+ break;
+ case 'l':
+ *c_size = size_long;
+ break;
+ case 'Z':
+ case 'z':
+ *c_size = size_size_t;
+ break;
+ case 'h':
+ *c_size = sizeof(short);
+ break;
+ default:
+ *c_size = sizeof(int);
+ }
+
+parse_end:
+ return fmt;
+}
+
+static inline const char *parse_trace_type(const char *fmt,
+ char *trace_size, enum ltt_type *trace_type,
+ char *base, unsigned long *attributes,
+ int arch_size, int size_long, int size_size_t)
+{
+ int qualifier;
+
+ /* parse attributes. */
+repeat:
+ switch (*fmt) {
+ case 'n':
+ *attributes |= (1<<1);
+ ++fmt;
+ goto repeat;
+ }
+
+ /* get the conversion qualifier */
+ qualifier = -1;
+ if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
+ *fmt == 'Z' || *fmt == 'z' || *fmt == 't' ||
+ *fmt == 'S' || *fmt == '1' || *fmt == '2' ||
+ *fmt == '4' || *fmt == 8) {
+ qualifier = *fmt;
+ ++fmt;
+ if (qualifier == 'l' && *fmt == 'l') {
+ qualifier = 'L';
+ ++fmt;
+ }
+ }
+
+ switch (*fmt) {
+ case 'c':
+ *base = 10;
+ *trace_type = LTT_TYPE_UNSIGNED_INT;
+ *trace_size = sizeof(unsigned char);
+ goto parse_end;
+ case 's':
+ *trace_type = LTT_TYPE_STRING;
+ goto parse_end;
+ case 'p':
+ *base = 16;
+ *trace_type = LTT_TYPE_UNSIGNED_INT;
+ *trace_size = arch_size;
+ goto parse_end;
+ case 'd':
+ case 'i':
+ *base = 10;
+ *trace_type = LTT_TYPE_SIGNED_INT;
+ break;
+ case 'o':
+ *base = 8;
+ *trace_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ case 'u':
+ *base = 10;
+ *trace_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ case 'x':
+ case 'X':
+ *base = 16;
+ *trace_type = LTT_TYPE_UNSIGNED_INT;
+ break;
+ default:
+ if (!*fmt)
+ --fmt;
+ goto parse_end;
+ }
+ switch (qualifier) {
+ case 'L':
+ *trace_size = sizeof(long long);
+ break;
+ case 'l':
+ *trace_size = size_long;
+ break;
+ case 'Z':
+ case 'z':
+ *trace_size = size_size_t;
+ break;
+ case 'h':
+ *trace_size = sizeof(short);
+ break;
+ case '1':
+ *trace_size = sizeof(uint8_t);
+ break;
+ case '2':
+ *trace_size = sizeof(uint16_t);
+ break;
+ case '4':
+ *trace_size = sizeof(uint32_t);
+ break;
+ case '8':
+ *trace_size = sizeof(uint64_t);
+ break;
+ default:
+ *trace_size = sizeof(int);
+ }
+
+parse_end:
+ return fmt;
+}
+
+int parse_format(char *out, const char *fmt,
+ int arch_size, int size_long, int size_size_t,
+ int (*write) (char *p, char trace_size, char c_size,
+ enum ltt_type c_type, char base, char *name))
+{
+ char trace_size = 0, c_size = 0; /* 0 (unset), 1, 2, 4, 8 bytes */
+ char base = 0; /* 0 (unset), 10, 16 */
+ enum ltt_type trace_type = LTT_TYPE_NONE, c_type = LTT_TYPE_NONE;
+ unsigned long attributes = 0;
+ char name[256];
+ char *pname = name;
+ int len = 0;
+
+ memset(name, 0, sizeof(name));
+
+ for (; *fmt ; ++fmt) {
+ switch (*fmt) {
+ case '#':
+ /* tracetypes (#) */
+ ++fmt; /* skip first '#' */
+ if (*fmt == '#') /* Escaped ## */
+ break;
+ attributes = 0;
+ fmt = parse_trace_type(fmt, &trace_size, &trace_type,
+ &base, &attributes,
+ arch_size, size_long, size_size_t);
+ break;
+ case '%':
+ /* c types (%) */
+ ++fmt; /* skip first '%' */
+ if (*fmt == '%') /* Escaped %% */
+ break;
+ fmt = parse_c_type(fmt, &c_size, &c_type, &base, NULL,
+ arch_size, size_long, size_size_t);
+ /*
+ * Output c types if no trace types has been
+ * specified.
+ */
+ if (!trace_size)
+ trace_size = c_size;
+ if (trace_type == LTT_TYPE_NONE)
+ trace_type = c_type;
+ if (c_type == LTT_TYPE_STRING)
+ trace_type = LTT_TYPE_STRING;
+ /* perform write */
+ len += write(out + len, trace_size, c_size, trace_type,
+ base, name);
+ trace_size = 0;
+ c_size = 0;
+ trace_type = LTT_TYPE_NONE;
+ c_size = LTT_TYPE_NONE;
+ attributes = 0;
+ memset(name, 0, sizeof(name));
+ pname = name;
+ break;
+ case ' ':
+ /* skip spaces */
+ continue;
+ default:
+ /* default is to copy the text as parameter name */
+ *pname = *fmt;
+ pname++;
+ }
+ }
+ return len;
+}
diff --git a/include/babeltrace/ltt-type-parser.h b/include/babeltrace/ltt-type-parser.h
new file mode 100644
index 0000000..85d9a92
--- /dev/null
+++ b/include/babeltrace/ltt-type-parser.h
@@ -0,0 +1,17 @@
+#ifndef _LTT_TYPE_PARSER_H
+#define _LTT_TYPE_PARSER_H
+
+#include <sys/types.h>
+
+enum ltt_type {
+ LTT_TYPE_SIGNED_INT,
+ LTT_TYPE_UNSIGNED_INT,
+ LTT_TYPE_STRING,
+ LTT_TYPE_NONE,
+};
+
+int parse_format(char *out, const char *fmt, int arch_size,
+ int size_long, int size_size_t,
+ int (*write) (char *p, char trace_size, char c_size,
+ enum ltt_type c_type, char base, char *name));
+#endif
--
1.7.9.5
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