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30 id 1Tm2L1-0005yc-4j; Fri, 21 Dec 2012 09:08:31 -0400
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31 From: david@tethera.net
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32 To: notmuch@notmuchmail.org
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33 Subject: [Patch v8 06/18] util/hex-escape: add a function to check strings
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34 unchanged by hex encoding.
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35 Date: Fri, 21 Dec 2012 09:08:15 -0400
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36 Message-Id: <1356095307-22895-6-git-send-email-david@tethera.net>
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39 References: <1356095307-22895-1-git-send-email-david@tethera.net>
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41 Cc: David Bremner <bremner@debian.org>
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56 From: David Bremner <bremner@debian.org>
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58 Initial use case is to recognize input tokens for batch tagging that
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61 util/hex-escape.c | 7 +++++++
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62 util/hex-escape.h | 8 ++++++++
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63 2 files changed, 15 insertions(+)
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65 diff --git a/util/hex-escape.c b/util/hex-escape.c
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66 index b7e2e07..b601a33 100644
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67 --- a/util/hex-escape.c
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68 +++ b/util/hex-escape.c
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71 #include "error_util.h"
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72 #include "hex-escape.h"
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73 +#include "string-util.h"
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75 static const size_t default_buf_size = 1024;
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77 @@ -38,6 +39,12 @@ is_output (char c)
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78 return (strchr (output_charset, c) != NULL);
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82 +hex_invariant (const char *str, size_t len)
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84 + return strnspn (str, len, output_charset);
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88 maybe_realloc (void *ctx, size_t needed, char **out, size_t *out_size)
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90 diff --git a/util/hex-escape.h b/util/hex-escape.h
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91 index 5182042..e7d0b31 100644
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92 --- a/util/hex-escape.h
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93 +++ b/util/hex-escape.h
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94 @@ -38,4 +38,12 @@ hex_decode (void *talloc_ctx, const char *in, char **out,
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97 hex_decode_inplace (char *s);
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100 + * Calculate the length of the initial segment of str that would not
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101 + * be changed by hex encoding. Consider at most `len' characters
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102 + * (bytes) before stopping.
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105 +hex_invariant (const char *str, size_t len);
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