tools: acrn-crashlog: string utils for acrn-crashlog

This file provides some string operations for acrn-crashlog.

Signed-off-by: Liu Xinwu <xinwu.liu@intel.com>
Reviewed-by: Zhang Yanmin <yanmin.zhang@intel.com>
Reviewed-by: Liu Chuansheng <chuansheng.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

tools/acrn-crashlog/common/Makefile

@@ -1,4 +1,5 @@
-objects = log_sys.o
+objects = log_sys.o \
+	  strutils.o
 
 all: check_obj $(objects)
 check_obj:

tools/acrn-crashlog/common/include/strutils.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2018 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __STRUTILS_H__
+#define __STRUTILS_H__
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+int strlinelen(char *str);
+char *strrstr(char *s, char *str);
+char *next_line(char *buf);
+char *strtrim(char *str);
+int strcnt(char *str, char c);
+
+#endif

tools/acrn-crashlog/common/strutils.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2018 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <errno.h>
+
+/**
+ * Get the length of line.
+ *
+ * @param str Start address of line.
+ *
+ * @return the length of line if successful, or -1 if not.
+ *	   This function return length of string if string doesn't contain \n.
+ */
+int strlinelen(char *str)
+{
+	char *tag;
+
+	if (!str)
+		return -1;
+
+	tag = strchr(str, '\n');
+	if (tag)
+		return tag - str + 1;
+
+	return strlen(str);
+}
+
+/**
+ * Find the last occurrence of the substring str in the string s.
+ *
+ * @param s Range of search.
+ * @param substr String to be found.
+ *
+ * @return a pointer to the beginning of the substring,
+ *	   or NULL if the substring is not found.
+ */
+char *strrstr(char *s, char *substr)
+{
+	char *found;
+	char *p = s;
+
+	while ((found = strstr(p, substr)))
+		p = found + 1;
+
+	if (p != s)
+		return p - 1;
+
+	return NULL;
+}
+
+char *next_line(char *buf)
+{
+	char *p;
+
+	p  = strchr(buf, '\n');
+	/* if meet end of buf, the return value is also NULL */
+	if (p)
+		return p + 1;
+
+	return NULL;
+}
+
+static char *strtriml(char *str)
+{
+	char *p = str;
+
+	while (*p == ' ')
+		p++;
+	return memmove(str, p, strlen(p) + 1);
+}
+
+static char *strtrimr(char *str)
+{
+	char *end = str + strlen(str) - 1;
+
+	while (*end == ' ' && end >= str) {
+		*end = 0;
+		end--;
+	}
+
+	return str;
+}
+
+char *strtrim(char *str)
+{
+	strtrimr(str);
+	return strtriml(str);
+}
+
+int strcnt(char *str, char c)
+{
+	int cnt = 0;
+	char *p = str;
+	char *found;
+
+	if (!str)
+		return -EINVAL;
+
+	while ((found = strchr(p, c))) {
+		p = found + 1;
+		cnt++;
+	}
+
+	return cnt;
+}