1 files changed, 130 insertions, 0 deletions
diff --git a/src/common/string.c b/src/common/string.c
new file mode 100644
index 0000000..16940d1
--- /dev/null
+++ b/src/common/string.c
@@ -0,0 +1,130 @@
+/*-------------------------------------------------------------------------
+ *
+ * string.c
+ *		string handling helpers
+ *
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/common/string.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/string.h"
+
+
+/*
+ * Returns whether the string `str' has the postfix `end'.
+ */
+bool
+pg_str_endswith(const char *str, const char *end)
+{
+	size_t		slen = strlen(str);
+	size_t		elen = strlen(end);
+
+	/* can't be a postfix if longer */
+	if (elen > slen)
+		return false;
+
+	/* compare the end of the strings */
+	str += slen - elen;
+	return strcmp(str, end) == 0;
+}
+
+
+/*
+ * strtoint --- just like strtol, but returns int not long
+ */
+int
+strtoint(const char *pg_restrict str, char **pg_restrict endptr, int base)
+{
+	long		val;
+
+	val = strtol(str, endptr, base);
+	if (val != (int) val)
+		errno = ERANGE;
+	return (int) val;
+}
+
+
+/*
+ * pg_clean_ascii -- Replace any non-ASCII chars with a '?' char
+ *
+ * Modifies the string passed in which must be '\0'-terminated.
+ *
+ * This function exists specifically to deal with filtering out
+ * non-ASCII characters in a few places where the client can provide an almost
+ * arbitrary string (and it isn't checked to ensure it's a valid username or
+ * database name or similar) and we don't want to have control characters or other
+ * things ending up in the log file where server admins might end up with a
+ * messed up terminal when looking at them.
+ *
+ * In general, this function should NOT be used- instead, consider how to handle
+ * the string without needing to filter out the non-ASCII characters.
+ *
+ * Ultimately, we'd like to improve the situation to not require stripping out
+ * all non-ASCII but perform more intelligent filtering which would allow UTF or
+ * similar, but it's unclear exactly what we should allow, so stick to ASCII only
+ * for now.
+ */
+void
+pg_clean_ascii(char *str)
+{
+	/* Only allow clean ASCII chars in the string */
+	char	   *p;
+
+	for (p = str; *p != '\0'; p++)
+	{
+		if (*p < 32 || *p > 126)
+			*p = '?';
+	}
+}
+
+
+/*
+ * pg_is_ascii -- Check if string is made only of ASCII characters
+ */
+bool
+pg_is_ascii(const char *str)
+{
+	while (*str)
+	{
+		if (IS_HIGHBIT_SET(*str))
+			return false;
+		str++;
+	}
+	return true;
+}
+
+
+/*
+ * pg_strip_crlf -- Remove any trailing newline and carriage return
+ *
+ * Removes any trailing newline and carriage return characters (\r on
+ * Windows) in the input string, zero-terminating it.
+ *
+ * The passed in string must be zero-terminated.  This function returns
+ * the new length of the string.
+ */
+int
+pg_strip_crlf(char *str)
+{
+	int			len = strlen(str);
+
+	while (len > 0 && (str[len - 1] == '\n' ||
+					   str[len - 1] == '\r'))
+		str[--len] = '\0';
+
+	return len;
+}