# HG changeset patch
# User Mike Becker <universe@uap-core.de>
# Date 1728578427 -7200
# Node ID 45da884269c878bcd4b1bdad922134aa3c0eba6e
# Parent  eabfbe9e29521ffc12b34e1cff0bf814a5bfbe70
add ucx2.1 style interface for a properties parser

relates to #429

diff -r eabfbe9e2952 -r 45da884269c8 src/Makefile
--- a/src/Makefile	Tue Oct 08 19:52:09 2024 +0200
+++ b/src/Makefile	Thu Oct 10 18:40:27 2024 +0200
@@ -25,7 +25,7 @@
 
 SRC = allocator.c array_list.c buffer.c compare.c hash_key.c hash_map.c \
   iterator.c linked_list.c list.c map.c mempool.c printf.c string.c tree.c \
-  utils.c
+  utils.c properties.c
 
 OBJ_EXT=.o
 OBJ=$(SRC:%.c=$(build_dir)/%$(OBJ_EXT))
@@ -125,6 +125,10 @@
 	@echo "Compiling $<"
 	$(CC) -o $@ $(CFLAGS) -c $<
 
+$(build_dir)/properties$(OBJ_EXT): properties.c cx/properties.h
+	@echo "Compiling $<"
+	$(CC) -o $@ $(CFLAGS) -c $<
+
 $(build_dir)/string$(OBJ_EXT): string.c cx/string.h cx/common.h \
  cx/allocator.h cx/utils.h
 	@echo "Compiling $<"
diff -r eabfbe9e2952 -r 45da884269c8 src/cx/properties.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cx/properties.h	Thu Oct 10 18:40:27 2024 +0200
@@ -0,0 +1,208 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \file properties.h
+ * \brief Interface for parsing data from properties files.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \copyright 2-Clause BSD License
+ */
+
+#ifndef UCX_PROPERTIES
+#define UCX_PROPERTIES
+
+#include "common.h"
+#include "string.h"
+
+struct cx_properties_config_s {
+    /**
+     * The key/value delimiter that shall be used.
+     * This is '=' by default.
+     */
+    char delimiter;
+
+    /**
+     * The character, when appearing at the end of a line, continues that line.
+     * This is '\' by default.
+     */
+    char continuation;
+
+    /**
+     * The first comment character.
+     * This is '#' by default.
+     */
+    char comment1;
+
+    /**
+     * The second comment character.
+     * This is not set by default.
+     */
+    char comment2;
+
+    /**
+     * The third comment character.
+     * This is not set by default.
+     */
+    char comment3;
+};
+
+/**
+ * Typedef for the properties config.
+ */
+typedef struct cx_properties_config_s CxPropertiesConfig;
+
+/**
+ * Default properties configuration.
+ */
+extern const CxPropertiesConfig cx_properties_config_default;
+
+/**
+ * Status codes for the properties interface.
+ */
+enum cx_properties_status {
+    /**
+     * Everything is fine.
+     */
+    CX_PROPERTIES_NO_ERROR,
+    /**
+     * The input buffer does not contain more data.
+     */
+    CX_PROPERTIES_NO_DATA,
+    /**
+     * The input ends unexpectedly.
+     *
+     * This either happens when the last line does not terminate with a line
+     * break, or when the input ends with a parsed key but no value.
+     */
+    CX_PROPERTIES_INCOMPLETE_DATA,
+    /**
+     * Input buffer is \c NULL.
+     */
+    CX_PROPERTIES_NULL_INPUT,
+};
+
+/**
+ * Interface for working with properties data.
+ */
+struct cx_properties_s {
+    /**
+     * The configuration.
+     */
+    CxPropertiesConfig config;
+
+    /**
+     * The text buffer.
+     */
+    const char *text;
+
+    /**
+     * Length of the text buffer.
+     */
+    size_t text_len;
+
+    /**
+     * Position in the text buffer.
+     */
+    size_t text_pos;
+};
+
+/**
+ * Typedef for the properties interface.
+ */
+typedef struct cx_properties_s CxProperties;
+
+
+/**
+ * Initialize a properties parser.
+ *
+ * @param prop the properties interface
+ * @param config the properties configuration
+ * @see cxPropertiesInitDefault()
+ */
+ __attribute__((__nonnull__))
+static inline void cxPropertiesInit(
+        CxProperties *prop,
+        CxPropertiesConfig config
+) {
+     prop->config = config;
+     prop->text = NULL;
+ }
+
+/**
+ * Initialize a properties parser with the default configuration.
+ *
+ * @param prop the properties interface
+ * @see cxPropertiesInit()
+ */
+#define cxPropertiesInitDefault(prop) \
+    cxPropertiesInit(prop, cx_properties_config_default)
+
+/**
+ * Sets an input buffer.
+ *
+ * After calling this function, you can parse the data by calling
+ * cxPropertiesNext() until the status is #CX_PROPERTIES_NO_DATA.
+ *
+ * @param prop the properties interface
+ * @param buf a pointer to data
+ * @param len the length of the data
+ */
+__attribute__((__nonnull__))
+static inline void cxPropertiesInput(
+        CxProperties *prop,
+        const void *buf,
+        size_t len
+) {
+    prop->text = buf;
+    prop->text_len = len;
+    prop->text_pos = 0;
+}
+
+/**
+ * Retrieves the next key/value-pair.
+ *
+ * This function returns zero as long as there are key/value-pairs
+ * found. If no more key/value-pairs are found, #CX_PROPERTIES_NO_DATA
+ * is returned. You may refill the input buffer with cxPropertiesInput().
+ *
+ * When an invalid line is encountered, #CX_PROPERTIES_INVALID_LINE is returned
+ * and the position of the input buffer will be the start of the affected line.
+ *
+ * @param prop the properties interface
+ * @param name a pointer to the cxstring that shall contain the property name
+ * @param value a pointer to the cxstring that shall contain the property value
+ * @return Nonzero, if a key/value-pair was successfully retrieved
+ * @see ucx_properties_fill()
+ */
+enum cx_properties_status cxPropertiesNext(
+        CxProperties *prop,
+        cxstring *name,
+        cxstring *value
+);
+
+#endif // UCX_PROPERTIES
diff -r eabfbe9e2952 -r 45da884269c8 src/properties.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/properties.c	Thu Oct 10 18:40:27 2024 +0200
@@ -0,0 +1,37 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2024 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cx/properties.h"
+
+const CxPropertiesConfig cx_properties_config_default = {
+        '=',
+        '\\',
+        '#',
+        '\0',
+        '\0'
+};