1 files changed, 139 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..0b8d8cb
--- /dev/null
+++ b/util.c
@@ -0,0 +1,139 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+char * alloc_concat(char * first, char * second)
+{
+	int flen = strlen(first);
+	int slen = strlen(second);
+	char * ret = malloc(flen + slen + 1);
+	memcpy(ret, first, flen);
+	memcpy(ret+flen, second, slen+1);
+	return ret;
+}
+
+char * alloc_concat_m(int num_parts, char ** parts)
+{
+	int total = 0;
+	for (int i = 0; i < num_parts; i++) {
+		total += strlen(parts[i]);
+	}
+	char * ret = malloc(total + 1);
+	*ret = 0;
+	for (int i = 0; i < num_parts; i++) {
+		strcat(ret, parts[i]);
+	}
+	return ret;
+}
+
+long file_size(FILE * f)
+{
+	fseek(f, 0, SEEK_END);
+	long fsize = ftell(f);
+	fseek(f, 0, SEEK_SET);
+	return fsize;
+}
+
+char * strip_ws(char * text)
+{
+	while (*text && (!isprint(*text) || isblank(*text)))
+	{
+		text++;
+	}
+	char * ret = text;
+	text = ret + strlen(ret) - 1;
+	while (text > ret && (!isprint(*text) || isblank(*text)))
+	{
+		*text = 0;
+		text--;
+	}
+	return ret;
+}
+
+char * split_keyval(char * text)
+{
+	while (*text && !isblank(*text))
+	{
+		text++;
+	}
+	if (!*text) {
+		return text;
+	}
+	*text = 0;
+	return text+1;
+}
+
+static char * exe_str;
+
+void set_exe_str(char * str)
+{
+	exe_str = str;
+}
+
+char * readlink_alloc(char * path)
+{
+	char * linktext = NULL;
+	ssize_t linksize = 512;
+	ssize_t cursize = 0;
+	do {
+		if (linksize > cursize) {
+			cursize = linksize;
+			if (linktext) {
+				free(linktext);
+			}
+		}
+		linktext = malloc(cursize);
+		linksize = readlink(path, linktext, cursize-1);
+		if (linksize == -1) {
+			perror("readlink");
+			free(linktext);
+			linktext = NULL;
+		}
+	} while (linksize > cursize);
+	return linktext;
+}
+
+char * get_exe_dir()
+{
+	static char * exe_dir;
+	if (!exe_dir) {
+		char * linktext = readlink_alloc("/proc/self/exe");
+		if (!linktext) {
+			goto fallback;
+		}
+		char * cur;
+		int linksize = strlen(linktext);
+		for(cur = linktext + linksize - 1; cur != linktext; cur--)
+		{
+			if (*cur == '/') {
+				*cur = 0;
+				break;
+			}
+		}
+		if (cur == linktext) {
+			free(linktext);
+fallback:
+			if (!exe_str) {
+				fputs("/proc/self/exe is not available and set_exe_str was not called!", stderr);
+			}
+			int pathsize = strlen(exe_str);
+			for(cur = exe_str + pathsize - 1; cur != exe_str; cur--)
+			{
+				if (*cur == '/') {
+					exe_dir = malloc(cur-exe_str+1);
+					memcpy(exe_dir, exe_str, cur-exe_str);
+					exe_dir[cur-exe_str] = 0;
+					break;
+				}
+			}
+		} else {
+			exe_dir = linktext;
+		}
+	}
+	return exe_dir;
+}