[Patch v8 06/18] util/hex-escape: add a function to check strings unchanged by hex...

diff --git a/59/8fd94f69377c1efa9d547fe0d0bc1b9edaa065 b/59/8fd94f69377c1efa9d547fe0d0bc1b9edaa065
new file mode 100644 (file)
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+++ b/59/8fd94f69377c1efa9d547fe0d0bc1b9edaa065
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+From: david@tethera.net\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v8 06/18] util/hex-escape: add a function to check strings\r
+       unchanged by hex encoding.\r
+Date: Fri, 21 Dec 2012 09:08:15 -0400\r
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+Cc: David Bremner <bremner@debian.org>\r
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+From: David Bremner <bremner@debian.org>\r
+\r
+Initial use case is to recognize input tokens for batch tagging that\r
+need quoting.\r
+---\r
+ util/hex-escape.c |    7 +++++++\r
+ util/hex-escape.h |    8 ++++++++\r
+ 2 files changed, 15 insertions(+)\r
+\r
+diff --git a/util/hex-escape.c b/util/hex-escape.c\r
+index b7e2e07..b601a33 100644\r
+--- a/util/hex-escape.c\r
++++ b/util/hex-escape.c\r
+@@ -24,6 +24,7 @@\r
+ #include <ctype.h>\r
+ #include "error_util.h"\r
+ #include "hex-escape.h"\r
++#include "string-util.h"\r
+ \r
+ static const size_t default_buf_size = 1024;\r
+ \r
+@@ -38,6 +39,12 @@ is_output (char c)\r
+     return (strchr (output_charset, c) != NULL);\r
+ }\r
+ \r
++size_t\r
++hex_invariant (const char *str, size_t len)\r
++{\r
++    return strnspn (str, len, output_charset);\r
++}\r
++\r
+ static int\r
+ maybe_realloc (void *ctx, size_t needed, char **out, size_t *out_size)\r
+ {\r
+diff --git a/util/hex-escape.h b/util/hex-escape.h\r
+index 5182042..e7d0b31 100644\r
+--- a/util/hex-escape.h\r
++++ b/util/hex-escape.h\r
+@@ -38,4 +38,12 @@ hex_decode (void *talloc_ctx, const char *in, char **out,\r
+  */\r
+ hex_status_t\r
+ hex_decode_inplace (char *s);\r
++\r
++/*\r
++ * Calculate the length of the initial segment of str that would not\r
++ * be changed by hex encoding. Consider at most `len' characters\r
++ * (bytes) before stopping.\r
++ */\r
++size_t\r
++hex_invariant (const char *str, size_t len);\r
+ #endif\r
+-- \r
+1.7.10.4\r
+\r