[Libguestfs] [PATCH nbdkit v3 3/6] common/utils: Add C string quoting function
eg. { '\r', '\n' } -> { '\\', 'n', '\\',
'r' }
---
common/utils/utils.h | 1 +
common/utils/quote.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/common/utils/utils.h b/common/utils/utils.h
index 42288a5cd..1e6d8972b 100644
--- a/common/utils/utils.h
+++ b/common/utils/utils.h
@@ -35,6 +35,7 @@
extern void shell_quote (const char *str, FILE *fp);
extern void uri_quote (const char *str, FILE *fp);
+extern void c_string_quote (const char *str, FILE *fp);
extern int exit_status_to_nbd_error (int status, const char *cmd);
extern int set_cloexec (int fd);
extern int set_nonblock (int fd);
diff --git a/common/utils/quote.c b/common/utils/quote.c
index 863e08a8e..877035387 100644
--- a/common/utils/quote.c
+++ b/common/utils/quote.c
@@ -37,6 +37,9 @@
#include <string.h>
#include <unistd.h>
+#include "ascii-ctype.h"
+#include "hexdigit.h"
+
/* Print str to fp, shell quoting if necessary. This comes from
* libguestfs, but was written by me so I'm relicensing it to a BSD
* license for nbdkit.
@@ -98,3 +101,58 @@ uri_quote (const char *str, FILE *fp)
fprintf (fp, "%%%02X", str[i] & 0xff);
}
}
+
+/* Print str to fp, quoting in a way similar to C strings, for example
+ * '\n' -> "\n".
+ *
+ * Note that we do not emit quotes around the string, and double
+ * quotes within the string are not escaped.
+ */
+void
+c_string_quote (const char *str, FILE *fp)
+{
+ size_t i;
+ char c;
+
+ for (i = 0; c = str[i], c != '\0'; ++i) {
+ if (ascii_isprint (c))
+ fputc (c, fp);
+ else {
+ switch (c) {
+ case '\a':
+ fputc ('\\', fp);
+ fputc ('a', fp);
+ break;
+ case '\b':
+ fputc ('\\', fp);
+ fputc ('b', fp);
+ break;
+ case '\f':
+ fputc ('\\', fp);
+ fputc ('f', fp);
+ break;
+ case '\n':
+ fputc ('\\', fp);
+ fputc ('n', fp);
+ break;
+ case '\r':
+ fputc ('\\', fp);
+ fputc ('r', fp);
+ break;
+ case '\t':
+ fputc ('\\', fp);
+ fputc ('t', fp);
+ break;
+ case '\v':
+ fputc ('\\', fp);
+ fputc ('v', fp);
+ break;
+ default:
+ fputc ('\\', fp);
+ fputc ('x', fp);
+ fputc (hexchar (c >> 4), fp);
+ fputc (hexchar (c), fp);
+ }
+ }
+ }
+}
--
2.39.2