1 files changed, 398 insertions, 0 deletions
diff --git a/check/check-icon-listing.c b/check/check-icon-listing.c
new file mode 100644
index 0000000..af9eb1f
--- /dev/null
+++ b/check/check-icon-listing.c
@@ -0,0 +1,398 @@
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+enum filetype {
+	ERROR,
+	NO_SUCH_FILE,
+	REGULAR,
+	SYMLINK,
+	OTHER_TYPE
+};
+
+static size_t lineno = 0;
+static char *text = NULL;
+static size_t textlen = 0;
+static int exitstatus = 0;
+static char *filebuf = NULL;
+static char *targetbuf = NULL;
+static char *relbuf = NULL;
+
+static void
+loadicons(void)
+{
+	int fd;
+	size_t size = 0;
+	ssize_t r;
+
+	fd = open("icons.mk", O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "Failed to open icons.mk: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	for (;;) {
+		if (textlen == size) {
+			size += 128UL << 10;
+			text = realloc(text, size);
+			if (!text) {
+				fprintf(stderr, "Failed to allocate enough memory to load icons.mk\n");
+				exit(1);
+			}
+		}
+
+		r = read(fd, &text[textlen], size - textlen);
+		if (r < 0) {
+			fprintf(stderr, "Failed to read icons.mk: %s\n", strerror(errno));
+			exit(1);
+		} else if (!r) {
+			break;
+		} else {
+			textlen += (size_t)r;
+		}
+	}
+
+	close(fd);
+}
+
+static char *
+nextline(void)
+{
+	static size_t pos = 0;
+	char *line = &text[pos];
+
+	if (pos == textlen)
+		return NULL;
+
+	lineno += 1;
+
+	for (; pos < textlen; pos++) {
+		if (!text[pos]) {
+			fprintf(stderr, "Line %zu in icons.mk contains NUL byte\n", lineno);
+			exitstatus = 1;
+			text[pos] = '^';
+		} else if (text[pos] == '\n') {
+			text[pos++] = '\0';
+			break;
+		}
+	}
+
+	return line;
+}
+
+static int
+iscomment(char *line)
+{
+	while (*line == ' ' || *line == '\t')
+		line++;
+	return *line == '#' || !*line;
+}
+
+static void
+remove_line_continuation(char *line)
+{
+	size_t n = strlen(line);
+	if (n && line[n - 1] == '\\')
+		line[n - 1] = '\0';
+}
+
+static void
+rstrip(char *line)
+{
+	size_t n = strlen(line);
+	while (n && (line[n - 1] == ' ' || line[n - 1] == '\t'))
+		line[--n] = '\0';
+}
+
+static size_t
+getindent(char **linep)
+{
+	size_t indent = 0;
+	char *line = *linep;
+	int warned_sp = 0;
+
+	for (;; line++) {
+		if (*line == ' ') {
+			if (!warned_sp) {
+				fprintf(stderr, "Line %zu in icons.mk contains SP character instead of HT\n", lineno);
+				warned_sp = 1;
+			}
+			exitstatus = 1;
+			indent += 1;
+		} else if (*line == '\t') {
+			indent += 8;
+		} else {
+			break;
+		}
+	}
+
+	*linep = line;
+	return (indent + 7) / 8;
+}
+
+static char *
+getfile(char *icon)
+{
+	static size_t size = 0;
+	size_t req = strlen(icon) + sizeof("scalable/.svg");
+	if (req > size) {
+		size = req;
+		filebuf = realloc(filebuf, size);
+		if (!filebuf) {
+			fprintf(stderr, "Failed to allocate enough memory to validate icons.mk\n");
+			exit(1);
+		}
+	}
+	stpcpy(stpcpy(stpcpy(filebuf, "scalable/"), icon), ".svg");
+	return filebuf;
+}
+
+static enum filetype
+getlink(char *file, char **target_out)
+{
+	static size_t size = 0;
+	ssize_t r;
+	struct stat st;
+
+	if (!size) {
+	grow_and_try_again:
+		size += 4096;
+		targetbuf = realloc(targetbuf, size);
+		if (!targetbuf) {
+			fprintf(stderr, "Failed to allocate enough memory to validate icons.mk\n");
+			exit(1);
+		}
+	}
+
+	r = readlink(file, targetbuf, size - 1);
+	if (r >= 0) {
+		if (r >= size - 2)
+			goto grow_and_try_again;
+		while (r && !targetbuf[r - 1])
+			r -= 1;
+		targetbuf[r] = '\0';
+		*target_out = targetbuf;
+		return SYMLINK;
+	} else if (errno == ENOENT) {
+		*target_out = NULL;
+		return NO_SUCH_FILE;
+	} else if (errno == EINVAL) {
+		*target_out = NULL;
+		if (!lstat(file, &st))
+			return S_ISREG(st.st_mode) ? REGULAR : OTHER_TYPE;
+		fprintf(stderr, "Failure at line %zu in icons.mk: lstat %s: %s\n", lineno, file, strerror(errno));
+		exitstatus = 1;
+		return ERROR;
+	} else {
+		fprintf(stderr, "Failure at line %zu in icons.mk: readlink %s: %s\n", lineno, file, strerror(errno));
+		exitstatus = 1;
+		*target_out = NULL;
+		return ERROR;
+	}
+}
+
+static char *
+rel(char *to, char *from)
+{
+	static size_t size = 0;
+	size_t i, req, up = 0;
+	char *p;
+
+	size_t off = 0;
+	for (i = 0; to[i]; i++) {
+		if (to[i] != from[i])
+			break;
+		if (to[i] == '/')
+			off = i + 1;
+	}
+	to = &to[off];
+	from = &from[off];
+
+	while ((from = strchr(from, '/'))) {
+		from = &from[1];
+		up += 1;
+	}
+
+	if (!up)
+		return to;
+
+	req = up * 3 + strlen(to) + 1;
+	if (req > size) {
+		size += 4096;
+		relbuf = realloc(relbuf, size = req);
+		if (!relbuf) {
+			fprintf(stderr, "Failed to allocate enough memory to validate icons.mk\n");
+			exit(1);
+		}
+	}
+
+	p = relbuf;
+	while (up--)
+		p = stpcpy(p, "../");
+	stpcpy(p, to);
+	return relbuf;
+}
+
+int
+main(void)
+{
+	char *line;
+	char *file;
+	char *target;
+	char *goal;
+	int ret = 0;
+	size_t count = 0;
+	size_t indent;
+	char **stack = NULL;
+	size_t stacksize = 0;
+	size_t stacklen = 0;
+	struct stat st1, st2;
+	const char *diff;
+	size_t len;
+	int fixed;
+
+	loadicons();
+
+	while ((line = nextline())) {
+		remove_line_continuation(line);
+		if (iscomment(line))
+			continue;
+		break;
+	}
+
+	while ((line = nextline())) {
+		remove_line_continuation(line);
+		if (iscomment(line))
+			continue;
+
+		count += 1;
+		rstrip(line);
+		indent = getindent(&line);
+		if (strchr(line, ' ') || strchr(line, '\t')) {
+			fprintf(stderr, "Line %zu in icons.mk contains unexpected whitespace\n", lineno);
+			exitstatus = 1;
+		}
+
+		if (!indent) {
+			fprintf(stderr, "Line %zu in icons.mk is not indented\n", lineno);
+			exitstatus = 1;
+			break;
+		}
+		indent -= 1;
+		if (indent > stacklen) {
+			fprintf(stderr, "Line %zu in icons.mk (%s) is overindented\n", lineno, line);
+			exitstatus = 1;
+			break;
+		}
+		if (stacksize <= indent) {
+			stacksize += 32;
+			stack = realloc(stack, stacksize * sizeof(*stack));
+			if (!stack) {
+				fprintf(stderr, "Failed to allocate enough memory to validate icons.mk\n");
+				exit(1);
+			}
+		}
+		stack[indent] = line;
+		stacklen = indent + 1;
+
+		file = getfile(line);
+		switch (getlink(file, &target)) {
+		case ERROR:
+			continue;
+		case NO_SUCH_FILE:
+			fprintf(stderr, "%s is listed but does not exist\n", line);
+			exitstatus = 1;
+			continue;
+		case REGULAR:
+			if (indent) {
+				fprintf(stderr, "%s is not a symlink but is listed as linking to %s\n", line, stack[indent - 1]);
+				exitstatus = 1;
+				continue;
+			}
+			break;
+		case SYMLINK:
+			if (!indent) {
+				fprintf(stderr, "%s is a symlink but not indented\n", line);
+				exitstatus = 1;
+			}
+			len = strlen(target);
+			if (len < 5 || strcmp(&target[len - 4], ".svg")) {
+				fprintf(stderr, "target of %s (%s) is not a .svg-file\n", line, target);
+				exitstatus = 1;
+				continue;
+			}
+			target[len -= 4] = '\0';
+			break;
+		case OTHER_TYPE:
+		default:
+			fprintf(stderr, "%s is listed as an icon but is not a regular file\n", line);
+			exitstatus = 1;
+			continue;
+		}
+
+		if (indent) {
+			if (stat(file, &st1)) {
+				if (errno == ENOENT) {
+					fprintf(stderr, "%s is a dangling symlink\n", line);
+				} else {
+					fprintf(stderr, "Failure at line %zu in icons.mk: stat %s: %s\n",
+					        lineno, line, strerror(errno));
+				}
+				exitstatus = 1;
+				continue;
+			}
+
+			file = getfile(stack[indent - 1]);
+			if (stat(file, &st2)) {
+				fprintf(stderr, "Failure at line %zu in icons.mk (%s): stat %s: %s\n",
+				        lineno, line, file, strerror(errno));
+			}
+
+			if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino)
+				diff = "same real file";
+			else
+				diff = "different real file";
+
+			fixed = 0;
+			while (target[0] == '.' && target[1] == '/') {
+				target = &target[2];
+				fixed = 1;
+			}
+			goal = rel(stack[indent - 1], line);
+			if (strcmp(target, goal)) {
+				fprintf(stderr, "%s links to %s.svg but should link to %s.svg [%s] (%s)\n",
+					line, target, goal, stack[indent - 1], diff);
+				exitstatus = 1;
+				continue;
+			}
+			if (fixed) {
+				fprintf(stderr, "Fixing symlink %s\n", line);
+				file = getfile(line);
+				*strchr(target, '\0') = '.'; /* restore ".svg" at the end of the string */
+				if (unlink(file)) {
+					fprintf(stderr, "... failed to unlink\n");
+				} else if (symlink(target, file)) {
+					fprintf(stderr, "... failed to create symlink (%s -> %s)\n", file, target);
+					exitstatus = 1;
+					break;
+				}
+			}
+		}
+	}
+
+	if (!count) {
+		fprintf(stderr, "No icons are listed in icons.mk\n");
+		exitstatus = 1;
+	}
+
+	free(stack);
+	free(text);
+	free(filebuf);
+	free(targetbuf);
+	free(relbuf);
+	return exitstatus;
+}