convert.c: simplify text_stat

Simplify the statistics:
lonecr counts the CR which is not followed by a LF,
lonelf counts the LF which is not preceded by a CR,
crlf counts CRLF combinations.
This simplifies the evaluation of the statistics.

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/convert.c b/convert.c
index e4e2877129f4d02db41ec9d31e47e507e86c2e5b..18af68502a79555f046f719055e1a0520dda7ec1 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -31,7 +31,7 @@ enum crlf_action {
 
 struct text_stat {
        /* NUL, CR, LF and CRLF counts */
-       unsigned nul, cr, lf, crlf;
+       unsigned nul, lonecr, lonelf, crlf;
 
        /* These are just approximations! */
        unsigned printable, nonprintable;
@@ -46,13 +46,15 @@ static void gather_stats(const char *buf, unsigned long size, struct text_stat *
        for (i = 0; i < size; i++) {
                unsigned char c = buf[i];
                if (c == '\r') {
-                       stats->cr++;
-                       if (i+1 < size && buf[i+1] == '\n')
+                       if (i+1 < size && buf[i+1] == '\n') {
                                stats->crlf++;
+                               i++;
+                       } else
+                               stats->lonecr++;
                        continue;
                }
                if (c == '\n') {
-                       stats->lf++;
+                       stats->lonelf++;
                        continue;
                }
                if (c == 127)
@@ -86,7 +88,7 @@ static void gather_stats(const char *buf, unsigned long size, struct text_stat *
  */
 static int convert_is_binary(unsigned long size, const struct text_stat *stats)
 {
-       if (stats->cr != stats->crlf)
+       if (stats->lonecr)
                return 1;
        if (stats->nul)
                return 1;
@@ -98,19 +100,18 @@ static int convert_is_binary(unsigned long size, const struct text_stat *stats)
 static unsigned int gather_convert_stats(const char *data, unsigned long size)
 {
        struct text_stat stats;
+       int ret = 0;
        if (!data || !size)
                return 0;
        gather_stats(data, size, &stats);
        if (convert_is_binary(size, &stats))
-               return CONVERT_STAT_BITS_BIN;
-       else if (stats.crlf && stats.crlf == stats.lf)
-               return CONVERT_STAT_BITS_TXT_CRLF;
-       else if (stats.crlf && stats.lf)
-               return CONVERT_STAT_BITS_TXT_CRLF | CONVERT_STAT_BITS_TXT_LF;
-       else if (stats.lf)
-               return CONVERT_STAT_BITS_TXT_LF;
-       else
-               return 0;
+               ret |= CONVERT_STAT_BITS_BIN;
+       if (stats.crlf)
+               ret |= CONVERT_STAT_BITS_TXT_CRLF;
+       if (stats.lonelf)
+               ret |=  CONVERT_STAT_BITS_TXT_LF;
+
+       return ret;
 }
 
 static const char *gather_convert_stats_ascii(const char *data, unsigned long size)
@@ -207,7 +208,7 @@ static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
                 * CRLFs would be added by checkout:
                 * check if we have "naked" LFs
                 */
-               if (stats->lf != stats->crlf) {
+               if (stats->lonelf) {
                        if (checksafe == SAFE_CRLF_WARN)
                                warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
                        else /* i.e. SAFE_CRLF_FAIL */
@@ -266,8 +267,8 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
 
        check_safe_crlf(path, crlf_action, &stats, checksafe);
 
-       /* Optimization: No CR? Nothing to convert, regardless. */
-       if (!stats.cr)
+       /* Optimization: No CRLF? Nothing to convert, regardless. */
+       if (!stats.crlf)
                return 0;
 
        /*
@@ -314,19 +315,15 @@ static int crlf_to_worktree(const char *path, const char *src, size_t len,
 
        gather_stats(src, len, &stats);
 
-       /* No LF? Nothing to convert, regardless. */
-       if (!stats.lf)
-               return 0;
-
-       /* Was it already in CRLF format? */
-       if (stats.lf == stats.crlf)
+       /* No "naked" LF? Nothing to convert, regardless. */
+       if (!stats.lonelf)
                return 0;
 
        if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
                if (crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
                        /* If we have any CR or CRLF line endings, we do not touch it */
                        /* This is the new safer autocrlf-handling */
-                       if (stats.cr > 0 || stats.crlf > 0)
+                       if (stats.lonecr || stats.crlf )
                                return 0;
                }
 
@@ -338,7 +335,7 @@ static int crlf_to_worktree(const char *path, const char *src, size_t len,
        if (src == buf->buf)
                to_free = strbuf_detach(buf, NULL);
 
-       strbuf_grow(buf, len + stats.lf - stats.crlf);
+       strbuf_grow(buf, len + stats.lonelf);
        for (;;) {
                const char *nl = memchr(src, '\n', len);
                if (!nl)