1 files changed, 289 insertions, 0 deletions
diff --git a/utils/nsxiv/util.c b/utils/nsxiv/util.c
new file mode 100644
index 0000000..d580839
--- /dev/null
+++ b/utils/nsxiv/util.c
@@ -0,0 +1,289 @@
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021-2022 nsxiv contributors
+ *
+ * This file is a part of nsxiv.
+ *
+ * nsxiv is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License,
+ * or (at your option) any later version.
+ *
+ * nsxiv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with nsxiv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "nsxiv.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+const char *progname;
+
+void* emalloc(size_t size)
+{
+	void *ptr;
+
+	ptr = malloc(size);
+	if (ptr == NULL)
+		error(EXIT_FAILURE, errno, NULL);
+	return ptr;
+}
+
+void* ecalloc(size_t nmemb, size_t size)
+{
+	void *ptr;
+
+	ptr = calloc(nmemb, size);
+	if (ptr == NULL)
+		error(EXIT_FAILURE, errno, NULL);
+	return ptr;
+}
+
+void* erealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL)
+		error(EXIT_FAILURE, errno, NULL);
+	return ptr;
+}
+
+char* estrdup(const char *s)
+{
+	char *d;
+	size_t n = strlen(s) + 1;
+
+	d = malloc(n);
+	if (d == NULL)
+		error(EXIT_FAILURE, errno, NULL);
+	memcpy(d, s, n);
+	return d;
+}
+
+void error(int eval, int err, const char* fmt, ...)
+{
+	va_list ap;
+
+	if (eval == 0 && options->quiet)
+		return;
+
+	fflush(stdout);
+	fprintf(stderr, "%s: ", progname);
+	va_start(ap, fmt);
+	if (fmt != NULL)
+		vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	if (err != 0)
+		fprintf(stderr, "%s%s", fmt != NULL ? ": " : "", strerror(err));
+	fputc('\n', stderr);
+
+	if (eval != 0)
+		exit(eval);
+}
+
+int r_opendir(r_dir_t *rdir, const char *dirname, bool recursive)
+{
+	if (*dirname == '\0')
+		return -1;
+
+	if ((rdir->dir = opendir(dirname)) == NULL) {
+		rdir->name = NULL;
+		rdir->stack = NULL;
+		return -1;
+	}
+
+	rdir->stcap = 512;
+	rdir->stack = emalloc(rdir->stcap * sizeof(char*));
+	rdir->stlen = 0;
+
+	rdir->name = (char*) dirname;
+	rdir->d = 0;
+	rdir->recursive = recursive;
+
+	return 0;
+}
+
+int r_closedir(r_dir_t *rdir)
+{
+	int ret = 0;
+
+	if (rdir->stack != NULL) {
+		while (rdir->stlen > 0)
+			free(rdir->stack[--rdir->stlen]);
+		free(rdir->stack);
+		rdir->stack = NULL;
+	}
+
+	if (rdir->dir != NULL) {
+		if ((ret = closedir(rdir->dir)) == 0)
+			rdir->dir = NULL;
+	}
+
+	if (rdir->d != 0) {
+		free(rdir->name);
+		rdir->name = NULL;
+	}
+
+	return ret;
+}
+
+char* r_readdir(r_dir_t *rdir, bool skip_dotfiles)
+{
+	size_t len;
+	char *filename;
+	struct dirent *dentry;
+	struct stat fstats;
+
+	while (true) {
+		if (rdir->dir != NULL && (dentry = readdir(rdir->dir)) != NULL) {
+			if (dentry->d_name[0] == '.') {
+				if (skip_dotfiles)
+					continue;
+				if (dentry->d_name[1] == '\0')
+					continue;
+				if (dentry->d_name[1] == '.' && dentry->d_name[2] == '\0')
+					continue;
+			}
+
+			len = strlen(rdir->name) + strlen(dentry->d_name) + 2;
+			filename = emalloc(len);
+			snprintf(filename, len, "%s%s%s", rdir->name,
+			         rdir->name[strlen(rdir->name)-1] == '/' ? "" : "/",
+			         dentry->d_name);
+
+			if (stat(filename, &fstats) < 0)
+				continue;
+			if (S_ISDIR(fstats.st_mode)) {
+				/* put subdirectory on the stack */
+				if (rdir->stlen == rdir->stcap) {
+					rdir->stcap *= 2;
+					rdir->stack = erealloc(rdir->stack,
+					                       rdir->stcap * sizeof(char*));
+				}
+				rdir->stack[rdir->stlen++] = filename;
+				continue;
+			}
+			return filename;
+		}
+
+		if (rdir->recursive && rdir->stlen > 0) {
+			/* open next subdirectory */
+			closedir(rdir->dir);
+			if (rdir->d != 0)
+				free(rdir->name);
+			rdir->name = rdir->stack[--rdir->stlen];
+			rdir->d = 1;
+			if ((rdir->dir = opendir(rdir->name)) == NULL)
+				error(0, errno, "%s", rdir->name);
+			continue;
+		}
+		/* no more entries */
+		break;
+	}
+	return NULL;
+}
+
+int r_mkdir(char *path)
+{
+	char c, *s = path;
+	struct stat st;
+
+	while (*s != '\0') {
+		if (*s == '/') {
+			s++;
+			continue;
+		}
+		for (; *s != '\0' && *s != '/'; s++);
+		c = *s;
+		*s = '\0';
+		if (mkdir(path, 0755) == -1)
+			if (errno != EEXIST || stat(path, &st) == -1 || !S_ISDIR(st.st_mode))
+				return -1;
+		*s = c;
+	}
+	return 0;
+}
+
+void construct_argv(char **argv, unsigned int len, ...)
+{
+	unsigned int i;
+	va_list args;
+
+	va_start(args, len);
+	for (i = 0; i < len; ++i)
+		argv[i] = va_arg(args, char *);
+	va_end(args);
+	if (argv[len-1] != NULL)
+		error(EXIT_FAILURE, 0, "argv not NULL terminated");
+}
+
+spawn_t spawn(const char *cmd, char *const argv[], unsigned int flags)
+{
+	pid_t pid;
+	spawn_t status = { -1, -1, -1 };
+	int pfd_read[2] = { -1, -1 };
+	int pfd_write[2] = { -1, -1 };
+	const bool r = flags & X_READ;
+	const bool w = flags & X_WRITE;
+
+	if (cmd == NULL || argv == NULL || flags == 0)
+		return status;
+
+	if (r && pipe(pfd_read) < 0) {
+		error(0, errno, "pipe: %s", cmd);
+		return status;
+	}
+
+	if (w && pipe(pfd_write) < 0) {
+		if (r) {
+			close(pfd_read[0]);
+			close(pfd_read[1]);
+		}
+		error(0, errno, "pipe: %s", cmd);
+		return status;
+	}
+
+	if ((pid = fork()) == 0) {
+		bool err = (r && dup2(pfd_read[1], 1) < 0) || (w && dup2(pfd_write[0], 0) < 0);
+		if (r) {
+			close(pfd_read[0]);
+			close(pfd_read[1]);
+		}
+		if (w) {
+			close(pfd_write[0]);
+			close(pfd_write[1]);
+		}
+
+		if (err)
+			error(EXIT_FAILURE, errno, "dup2: %s", cmd);
+		execv(cmd, argv);
+		error(EXIT_FAILURE, errno, "exec: %s", cmd);
+	}
+
+	if (r)
+		close(pfd_read[1]);
+	if (w)
+		close(pfd_write[0]);
+
+	if (pid < 0) {
+		if (r)
+			close(pfd_read[0]);
+		if (w)
+			close(pfd_write[1]);
+		error(0, errno, "fork: %s", cmd);
+		return status;
+	}
+
+	status.pid = pid;
+	status.readfd = pfd_read[0];
+	status.writefd = pfd_write[1];
+	return status;
+}