refactor example config and add ini.c

10 files changed, 463 insertions, 158 deletions

diff --git a/examples/config.c b/examples/config.c
new file mode 100644
index 00000000..4f70faf0
--- /dev/null
+++ b/examples/config.c
@@ -0,0 +1,146 @@
+#include <stdlib.h>
+#include <limits.h>
+#include <getopt.h>
+#include <string.h>
+#include "shared.h"
+#include "config.h"
+
+static void usage(const char *name, int ret) {
+	fprintf(stderr,
+		"usage: %s [-d <name> [-r <rotation> | -f]]*\n"
+		"\n"
+		" -o <output>    The name of the DRM display. e.g. DVI-I-1.\n"
+		" -r <rotation>  The rotation counter clockwise. Valid values are 90, 180, 270.\n"
+		" -x <position>  The X-axis coordinate position of this output in the layout.\n"
+		" -y <position>  The Y-axis coordinate position of this output in the layout.\n"
+		" -f             Flip the output along the vertical axis.\n", name);
+
+	exit(ret);
+}
+
+struct example_config *parse_args(int argc, char *argv[]) {
+	struct example_config *config = calloc(1, sizeof(struct example_config));
+	wl_list_init(&config->outputs);
+	struct output_config *oc = NULL;
+
+	int c;
+	while ((c = getopt(argc, argv, "o:r:x:y:fh")) != -1) {
+		switch (c) {
+		case 'o':
+			oc = calloc(1, sizeof(*oc));
+			oc->name = optarg;
+			oc->transform = WL_OUTPUT_TRANSFORM_NORMAL;
+			wl_list_insert(&config->outputs, &oc->link);
+			break;
+		case 'r':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+
+			if (oc->transform != WL_OUTPUT_TRANSFORM_NORMAL
+					&& oc->transform != WL_OUTPUT_TRANSFORM_FLIPPED) {
+				fprintf(stderr, "Rotation for %s already specified\n", oc->name);
+				usage(argv[0], 1);
+			}
+
+			if (strcmp(optarg, "90") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_90;
+			} else if (strcmp(optarg, "180") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_180;
+			} else if (strcmp(optarg, "270") == 0) {
+				oc->transform += WL_OUTPUT_TRANSFORM_270;
+			} else {
+				fprintf(stderr, "Invalid rotation '%s'\n", optarg);
+				usage(argv[0], 1);
+			}
+			break;
+		case 'x':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+			oc->x = strtol(optarg, NULL, 0);
+			break;
+		case 'y':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+			oc->y = strtol(optarg, NULL, 0);
+			break;
+		case 'f':
+			if (!oc) {
+				fprintf(stderr, "You must specify an output first\n");
+				usage(argv[0], 1);
+			}
+
+			if (oc->transform >= WL_OUTPUT_TRANSFORM_FLIPPED) {
+				fprintf(stderr, "Flip for %s already specified\n", oc->name);
+				usage(argv[0], 1);
+			}
+
+			oc->transform += WL_OUTPUT_TRANSFORM_FLIPPED;
+			break;
+		case 'h':
+		case '?':
+			usage(argv[0], c != 'h');
+		}
+	}
+
+	return config;
+}
+
+void example_config_destroy(struct example_config *config) {
+	struct output_config *oc, *tmp = NULL;
+	wl_list_for_each_safe(oc, tmp, &config->outputs, link) {
+		free(oc);
+	}
+	free(config);
+}
+
+struct wlr_output_layout *configure_layout(struct example_config *config, struct wl_list *outputs) {
+	struct wlr_output_layout *layout = wlr_output_layout_init();
+	int max_x = INT_MIN;
+	int max_x_y = INT_MIN; // y value for the max_x output
+
+	// first add all the configured outputs
+	struct output_state *output;
+	wl_list_for_each(output, outputs, link) {
+		struct output_config *conf;
+		wl_list_for_each(conf, &config->outputs, link) {
+			if (strcmp(conf->name, output->output->name) == 0) {
+				wlr_output_layout_add(layout, output->output,
+						conf->x, conf->y);
+				wlr_output_transform(output->output, conf->transform);
+				int width, height;
+				wlr_output_effective_resolution(output->output, &width, &height);
+				if (conf->x + width > max_x) {
+					max_x = conf->x + width;
+					max_x_y = conf->y;
+				}
+				break;
+			}
+		}
+	}
+
+	if (max_x == INT_MIN) {
+		// couldn't find a configured output
+		max_x = 0;
+		max_x_y = 0;
+	}
+
+	// now add all the other configured outputs in a sensible position
+	wl_list_for_each(output, outputs, link) {
+		if (wlr_output_layout_get(layout, output->output)) {
+			continue;
+		}
+		wlr_output_layout_add(layout, output->output, max_x, max_x_y);
+		int width, height;
+		wlr_output_effective_resolution(output->output, &width, &height);
+		max_x += width;
+	}
+
+	return layout;
+}
+
diff --git a/examples/config.h b/examples/config.h
new file mode 100644
index 00000000..1ecadd81
--- /dev/null
+++ b/examples/config.h
@@ -0,0 +1,25 @@
+#ifndef _EXAMPLE_CONFIG_H
+#define _EXAMPLE_CONFIG_H
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+#include <wlr/types/wlr_output_layout.h>
+
+struct output_config {
+	char *name;
+	enum wl_output_transform transform;
+	int x, y;
+	struct wl_list link;
+};
+
+struct example_config {
+	struct wl_list outputs;
+};
+
+struct example_config *parse_args(int argc, char *argv[]);
+
+void example_config_destroy(struct example_config *config);
+
+struct wlr_output_layout *configure_layout(struct example_config *config,
+		struct wl_list *outputs);
+#endif
diff --git a/examples/ini.c b/examples/ini.c
new file mode 100644
index 00000000..6be9c44a
--- /dev/null
+++ b/examples/ini.c
@@ -0,0 +1,195 @@
+/* inih -- simple .INI file parser
+
+inih is released under the New BSD license (see LICENSE.txt). Go to the project
+home page for more info:
+
+https://github.com/benhoyt/inih
+
+*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#include "ini.h"
+
+#if !INI_USE_STACK
+#include <stdlib.h>
+#endif
+
+#define MAX_SECTION 50
+#define MAX_NAME 50
+
+/* Strip whitespace chars off end of given string, in place. Return s. */
+static char* rstrip(char* s)
+{
+    char* p = s + strlen(s);
+    while (p > s && isspace((unsigned char)(*--p)))
+        *p = '\0';
+    return s;
+}
+
+/* Return pointer to first non-whitespace char in given string. */
+static char* lskip(const char* s)
+{
+    while (*s && isspace((unsigned char)(*s)))
+        s++;
+    return (char*)s;
+}
+
+/* Return pointer to first char (of chars) or inline comment in given string,
+   or pointer to null at end of string if neither found. Inline comment must
+   be prefixed by a whitespace character to register as a comment. */
+static char* find_chars_or_comment(const char* s, const char* chars)
+{
+#if INI_ALLOW_INLINE_COMMENTS
+    int was_space = 0;
+    while (*s && (!chars || !strchr(chars, *s)) &&
+           !(was_space && strchr(INI_INLINE_COMMENT_PREFIXES, *s))) {
+        was_space = isspace((unsigned char)(*s));
+        s++;
+    }
+#else
+    while (*s && (!chars || !strchr(chars, *s))) {
+        s++;
+    }
+#endif
+    return (char*)s;
+}
+
+/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
+static char* strncpy0(char* dest, const char* src, size_t size)
+{
+    strncpy(dest, src, size);
+    dest[size - 1] = '\0';
+    return dest;
+}
+
+/* See documentation in header file. */
+int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
+                     void* user)
+{
+    /* Uses a fair bit of stack (use heap instead if you need to) */
+#if INI_USE_STACK
+    char line[INI_MAX_LINE];
+#else
+    char* line;
+#endif
+    char section[MAX_SECTION] = "";
+    char prev_name[MAX_NAME] = "";
+
+    char* start;
+    char* end;
+    char* name;
+    char* value;
+    int lineno = 0;
+    int error = 0;
+
+#if !INI_USE_STACK
+    line = (char*)malloc(INI_MAX_LINE);
+    if (!line) {
+        return -2;
+    }
+#endif
+
+    /* Scan through stream line by line */
+    while (reader(line, INI_MAX_LINE, stream) != NULL) {
+        lineno++;
+
+        start = line;
+#if INI_ALLOW_BOM
+        if (lineno == 1 && (unsigned char)start[0] == 0xEF &&
+                           (unsigned char)start[1] == 0xBB &&
+                           (unsigned char)start[2] == 0xBF) {
+            start += 3;
+        }
+#endif
+        start = lskip(rstrip(start));
+
+        if (*start == ';' || *start == '#') {
+            /* Per Python configparser, allow both ; and # comments at the
+               start of a line */
+        }
+#if INI_ALLOW_MULTILINE
+        else if (*prev_name && *start && start > line) {
+            /* Non-blank line with leading whitespace, treat as continuation
+               of previous name's value (as per Python configparser). */
+            if (!handler(user, section, prev_name, start) && !error)
+                error = lineno;
+        }
+#endif
+        else if (*start == '[') {
+            /* A "[section]" line */
+            end = find_chars_or_comment(start + 1, "]");
+            if (*end == ']') {
+                *end = '\0';
+                strncpy0(section, start + 1, sizeof(section));
+                *prev_name = '\0';
+            }
+            else if (!error) {
+                /* No ']' found on section line */
+                error = lineno;
+            }
+        }
+        else if (*start) {
+            /* Not a comment, must be a name[=:]value pair */
+            end = find_chars_or_comment(start, "=:");
+            if (*end == '=' || *end == ':') {
+                *end = '\0';
+                name = rstrip(start);
+                value = lskip(end + 1);
+#if INI_ALLOW_INLINE_COMMENTS
+                end = find_chars_or_comment(value, NULL);
+                if (*end)
+                    *end = '\0';
+#endif
+                rstrip(value);
+
+                /* Valid name[=:]value pair found, call handler */
+                strncpy0(prev_name, name, sizeof(prev_name));
+                if (!handler(user, section, name, value) && !error)
+                    error = lineno;
+				memset(value, 0, strlen(value));
+            }
+            else if (!error) {
+                /* No '=' or ':' found on name[=:]value line */
+                error = lineno;
+            }
+        }
+
+#if INI_STOP_ON_FIRST_ERROR
+        if (error)
+            break;
+#endif
+    }
+
+#if !INI_USE_STACK
+    free(line);
+#endif
+
+    return error;
+}
+
+/* See documentation in header file. */
+int ini_parse_file(FILE* file, ini_handler handler, void* user)
+{
+    return ini_parse_stream((ini_reader)fgets, file, handler, user);
+}
+
+/* See documentation in header file. */
+int ini_parse(const char* filename, ini_handler handler, void* user)
+{
+    FILE* file;
+    int error;
+
+    file = fopen(filename, "r");
+    if (!file)
+        return -1;
+    error = ini_parse_file(file, handler, user);
+    fclose(file);
+    return error;
+}
diff --git a/examples/ini.h b/examples/ini.h
new file mode 100644
index 00000000..2804255b
--- /dev/null
+++ b/examples/ini.h
@@ -0,0 +1,93 @@
+/* inih -- simple .INI file parser
+
+inih is released under the New BSD license (see LICENSE.txt). Go to the project
+home page for more info:
+
+https://github.com/benhoyt/inih
+
+*/
+
+#ifndef __INI_H__
+#define __INI_H__
+
+/* Make this header file easier to include in C++ code */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+
+/* Typedef for prototype of handler function. */
+typedef int (*ini_handler)(void* user, const char* section,
+                           const char* name, const char* value);
+
+/* Typedef for prototype of fgets-style reader function. */
+typedef char* (*ini_reader)(char* str, int num, void* stream);
+
+/* Parse given INI-style file. May have [section]s, name=value pairs
+   (whitespace stripped), and comments starting with ';' (semicolon). Section
+   is "" if name=value pair parsed before any section heading. name:value
+   pairs are also supported as a concession to Python's configparser.
+
+   For each name=value pair parsed, call handler function with given user
+   pointer as well as section, name, and value (data only valid for duration
+   of handler call). Handler should return nonzero on success, zero on error.
+
+   Returns 0 on success, line number of first error on parse error (doesn't
+   stop on first error), -1 on file open error, or -2 on memory allocation
+   error (only when INI_USE_STACK is zero).
+*/
+int ini_parse(const char* filename, ini_handler handler, void* user);
+
+/* Same as ini_parse(), but takes a FILE* instead of filename. This doesn't
+   close the file when it's finished -- the caller must do that. */
+int ini_parse_file(FILE* file, ini_handler handler, void* user);
+
+/* Same as ini_parse(), but takes an ini_reader function pointer instead of
+   filename. Used for implementing custom or string-based I/O. */
+int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
+                     void* user);
+
+/* Nonzero to allow multi-line value parsing, in the style of Python's
+   configparser. If allowed, ini_parse() will call the handler with the same
+   name for each subsequent line parsed. */
+#ifndef INI_ALLOW_MULTILINE
+#define INI_ALLOW_MULTILINE 1
+#endif
+
+/* Nonzero to allow a UTF-8 BOM sequence (0xEF 0xBB 0xBF) at the start of
+   the file. See http://code.google.com/p/inih/issues/detail?id=21 */
+#ifndef INI_ALLOW_BOM
+#define INI_ALLOW_BOM 1
+#endif
+
+/* Nonzero to allow inline comments (with valid inline comment characters
+   specified by INI_INLINE_COMMENT_PREFIXES). Set to 0 to turn off and match
+   Python 3.2+ configparser behaviour. */
+#ifndef INI_ALLOW_INLINE_COMMENTS
+#define INI_ALLOW_INLINE_COMMENTS 1
+#endif
+#ifndef INI_INLINE_COMMENT_PREFIXES
+#define INI_INLINE_COMMENT_PREFIXES ";"
+#endif
+
+/* Nonzero to use stack, zero to use heap (malloc/free). */
+#ifndef INI_USE_STACK
+#define INI_USE_STACK 1
+#endif
+
+/* Stop parsing on first error (default is to keep parsing). */
+#ifndef INI_STOP_ON_FIRST_ERROR
+#define INI_STOP_ON_FIRST_ERROR 0
+#endif
+
+/* Maximum line length for any line in INI file. */
+#ifndef INI_MAX_LINE
+#define INI_MAX_LINE 2000
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INI_H__ */
diff --git a/examples/meson.build b/examples/meson.build
index d4d96984..8fda974f 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -1,5 +1,5 @@
 lib_shared = static_library('shared',
-  ['shared.c', 'cat.c'],
+  ['shared.c', 'cat.c', 'ini.c', 'config.c'],
   dependencies: wlroots)
 
 executable('simple', 'simple.c', dependencies: wlroots, link_with: lib_shared)
diff --git a/examples/output-layout.c b/examples/output-layout.c
index 041d5788..90ad558f 100644
--- a/examples/output-layout.c
+++ b/examples/output-layout.c
@@ -22,6 +22,7 @@
 #include <wlr/types/wlr_keyboard.h>
 #include <math.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
 struct sample_state {
diff --git a/examples/pointer.c b/examples/pointer.c
index 95e28bb2..fcf9805f 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -22,6 +22,7 @@
 #include <wlr/types/wlr_cursor.h>
 #include <wlr/util/log.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
 struct sample_input_device {
diff --git a/examples/rotation.c b/examples/rotation.c
index 1dcbc80f..2596e492 100644
--- a/examples/rotation.c
+++ b/examples/rotation.c
@@ -19,6 +19,7 @@
 #include <wlr/util/log.h>
 #include <math.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
 struct sample_state {
diff --git a/examples/shared.c b/examples/shared.c
index 1dad8016..f9d687e3 100644
--- a/examples/shared.c
+++ b/examples/shared.c
@@ -18,145 +18,6 @@
 #include <wlr/util/log.h>
 #include "shared.h"
 
-static void usage(const char *name, int ret) {
-	fprintf(stderr,
-		"usage: %s [-d <name> [-r <rotation> | -f]]*\n"
-		"\n"
-		" -o <output>    The name of the DRM display. e.g. DVI-I-1.\n"
-		" -r <rotation>  The rotation counter clockwise. Valid values are 90, 180, 270.\n"
-		" -x <position>  The X-axis coordinate position of this output in the layout.\n"
-		" -y <position>  The Y-axis coordinate position of this output in the layout.\n"
-		" -f             Flip the output along the vertical axis.\n", name);
-
-	exit(ret);
-}
-
-struct example_config *parse_args(int argc, char *argv[]) {
-	struct example_config *config = calloc(1, sizeof(struct example_config));
-	wl_list_init(&config->outputs);
-	struct output_config *oc = NULL;
-
-	int c;
-	while ((c = getopt(argc, argv, "o:r:x:y:fh")) != -1) {
-		switch (c) {
-		case 'o':
-			oc = calloc(1, sizeof(*oc));
-			oc->name = optarg;
-			oc->transform = WL_OUTPUT_TRANSFORM_NORMAL;
-			wl_list_insert(&config->outputs, &oc->link);
-			break;
-		case 'r':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-
-			if (oc->transform != WL_OUTPUT_TRANSFORM_NORMAL
-					&& oc->transform != WL_OUTPUT_TRANSFORM_FLIPPED) {
-				fprintf(stderr, "Rotation for %s already specified\n", oc->name);
-				usage(argv[0], 1);
-			}
-
-			if (strcmp(optarg, "90") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_90;
-			} else if (strcmp(optarg, "180") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_180;
-			} else if (strcmp(optarg, "270") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_270;
-			} else {
-				fprintf(stderr, "Invalid rotation '%s'\n", optarg);
-				usage(argv[0], 1);
-			}
-			break;
-		case 'x':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-			oc->x = strtol(optarg, NULL, 0);
-			break;
-		case 'y':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-			oc->y = strtol(optarg, NULL, 0);
-			break;
-		case 'f':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-
-			if (oc->transform >= WL_OUTPUT_TRANSFORM_FLIPPED) {
-				fprintf(stderr, "Flip for %s already specified\n", oc->name);
-				usage(argv[0], 1);
-			}
-
-			oc->transform += WL_OUTPUT_TRANSFORM_FLIPPED;
-			break;
-		case 'h':
-		case '?':
-			usage(argv[0], c != 'h');
-		}
-	}
-
-	return config;
-}
-
-void example_config_destroy(struct example_config *config) {
-	struct output_config *oc, *tmp = NULL;
-	wl_list_for_each_safe(oc, tmp, &config->outputs, link) {
-		free(oc);
-	}
-	free(config);
-}
-
-struct wlr_output_layout *configure_layout(struct example_config *config, struct wl_list *outputs) {
-	struct wlr_output_layout *layout = wlr_output_layout_init();
-	int max_x = INT_MIN;
-	int max_x_y = INT_MIN; // y value for the max_x output
-
-	// first add all the configured outputs
-	struct output_state *output;
-	wl_list_for_each(output, outputs, link) {
-		struct output_config *conf;
-		wl_list_for_each(conf, &config->outputs, link) {
-			if (strcmp(conf->name, output->output->name) == 0) {
-				wlr_output_layout_add(layout, output->output,
-						conf->x, conf->y);
-				wlr_output_transform(output->output, conf->transform);
-				int width, height;
-				wlr_output_effective_resolution(output->output, &width, &height);
-				if (conf->x + width > max_x) {
-					max_x = conf->x + width;
-					max_x_y = conf->y;
-				}
-				break;
-			}
-		}
-	}
-
-	if (max_x == INT_MIN) {
-		// couldn't find a configured output
-		max_x = 0;
-		max_x_y = 0;
-	}
-
-	// now add all the other configured outputs in a sensible position
-	wl_list_for_each(output, outputs, link) {
-		if (wlr_output_layout_get(layout, output->output)) {
-			continue;
-		}
-		wlr_output_layout_add(layout, output->output, max_x, max_x_y);
-		int width, height;
-		wlr_output_effective_resolution(output->output, &width, &height);
-		max_x += width;
-	}
-
-	return layout;
-}
-
 
 static void keyboard_led_update(struct keyboard_state *kbstate) {
 	uint32_t leds = 0;
diff --git a/examples/shared.h b/examples/shared.h
index d9972ffd..06108494 100644
--- a/examples/shared.h
+++ b/examples/shared.h
@@ -12,24 +12,6 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_input_device.h>
 
-struct output_config {
-	char *name;
-	enum wl_output_transform transform;
-	int x, y;
-	struct wl_list link;
-};
-
-struct example_config {
-	struct wl_list outputs;
-};
-
-struct example_config *parse_args(int argc, char *argv[]);
-
-void example_config_destroy(struct example_config *config);
-
-struct wlr_output_layout *configure_layout(struct example_config *config,
-		struct wl_list *outputs);
-
 struct output_state {
 	struct compositor_state *compositor;
 	struct wlr_output *output;