grep doc: add --break / --heading / -W to synopsis

[git.git] / convert.c

diff --git a/convert.c b/convert.c
index c9ab54ffd2f84b0c501a6582c3837371efd34464..4534e2c2b003998a590637fc43c0549ff23f71b2 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -2,6 +2,7 @@
 #include "attr.h"
 #include "run-command.h"
 #include "quote.h"
+#include "sigchain.h"
 
 /*
  * convert.c - convert a file when checking it out and checking it in.
@@ -195,9 +196,17 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
        char *dst;
 
        if (crlf_action == CRLF_BINARY ||
-           (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || !len)
+           (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) ||
+           (src && !len))
                return 0;
 
+       /*
+        * If we are doing a dry-run and have no source buffer, there is
+        * nothing to analyze; we must assume we would convert.
+        */
+       if (!buf && !src)
+               return 1;
+
        gather_stats(src, len, &stats);
 
        if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
@@ -231,6 +240,13 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
        if (!stats.cr)
                return 0;
 
+       /*
+        * At this point all of our source analysis is done, and we are sure we
+        * would convert. If we are in dry-run mode, we can give an answer.
+        */
+       if (!buf)
+               return 1;
+
        /* only grow if not in place */
        if (strbuf_avail(buf) + buf->len < len)
                strbuf_grow(buf, len - buf->len);
@@ -360,12 +376,16 @@ static int filter_buffer(int in, int out, void *data)
        if (start_command(&child_process))
                return error("cannot fork to run external filter %s", params->cmd);
 
+       sigchain_push(SIGPIPE, SIG_IGN);
+
        write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
        if (close(child_process.in))
                write_err = 1;
        if (write_err)
                error("cannot feed the input to external filter %s", params->cmd);
 
+       sigchain_pop(SIGPIPE);
+
        status = finish_command(&child_process);
        if (status)
                error("external filter %s failed %d", params->cmd, status);
@@ -391,6 +411,9 @@ static int apply_filter(const char *path, const char *src, size_t len,
        if (!cmd)
                return 0;
 
+       if (!dst)
+               return 1;
+
        memset(&async, 0, sizeof(async));
        async.proc = filter_buffer;
        async.data = &params;
@@ -522,9 +545,12 @@ static int ident_to_git(const char *path, const char *src, size_t len,
 {
        char *dst, *dollar;
 
-       if (!ident || !count_ident(src, len))
+       if (!ident || (src && !count_ident(src, len)))
                return 0;
 
+       if (!buf)
+               return 1;
+
        /* only grow if not in place */
        if (strbuf_avail(buf) + buf->len < len)
                strbuf_grow(buf, len - buf->len);
@@ -754,13 +780,13 @@ int convert_to_git(const char *path, const char *src, size_t len,
                filter = ca.drv->clean;
 
        ret |= apply_filter(path, src, len, dst, filter);
-       if (ret) {
+       if (ret && dst) {
                src = dst->buf;
                len = dst->len;
        }
        ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
        ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
-       if (ret) {
+       if (ret && dst) {
                src = dst->buf;
                len = dst->len;
        }
@@ -879,7 +905,8 @@ int is_null_stream_filter(struct stream_filter *filter)
 
 struct lf_to_crlf_filter {
        struct stream_filter filter;
-       unsigned want_lf:1;
+       unsigned has_held:1;
+       char held;
 };
 
 static int lf_to_crlf_filter_fn(struct stream_filter *filter,
@@ -889,10 +916,14 @@ static int lf_to_crlf_filter_fn(struct stream_filter *filter,
        size_t count, o = 0;
        struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
 
-       /* Output a pending LF if we need to */
-       if (lf_to_crlf->want_lf) {
-               output[o++] = '\n';
-               lf_to_crlf->want_lf = 0;
+       /*
+        * We may be holding onto the CR to see if it is followed by a
+        * LF, in which case we would need to go to the main loop.
+        * Otherwise, just emit it to the output stream.
+        */
+       if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
+               output[o++] = lf_to_crlf->held;
+               lf_to_crlf->has_held = 0;
        }
 
        /* We are told to drain */
@@ -902,22 +933,57 @@ static int lf_to_crlf_filter_fn(struct stream_filter *filter,
        }
 
        count = *isize_p;
-       if (count) {
+       if (count || lf_to_crlf->has_held) {
                size_t i;
+               int was_cr = 0;
+
+               if (lf_to_crlf->has_held) {
+                       was_cr = 1;
+                       lf_to_crlf->has_held = 0;
+               }
+
                for (i = 0; o < *osize_p && i < count; i++) {
                        char ch = input[i];
+
                        if (ch == '\n') {
                                output[o++] = '\r';
-                               if (o >= *osize_p) {
-                                       lf_to_crlf->want_lf = 1;
-                                       continue; /* We need to increase i */
-                               }
+                       } else if (was_cr) {
+                               /*
+                                * Previous round saw CR and it is not followed
+                                * by a LF; emit the CR before processing the
+                                * current character.
+                                */
+                               output[o++] = '\r';
                        }
+
+                       /*
+                        * We may have consumed the last output slot,
+                        * in which case we need to break out of this
+                        * loop; hold the current character before
+                        * returning.
+                        */
+                       if (*osize_p <= o) {
+                               lf_to_crlf->has_held = 1;
+                               lf_to_crlf->held = ch;
+                               continue; /* break but increment i */
+                       }
+
+                       if (ch == '\r') {
+                               was_cr = 1;
+                               continue;
+                       }
+
+                       was_cr = 0;
                        output[o++] = ch;
                }
 
                *osize_p -= o;
                *isize_p -= i;
+
+               if (!lf_to_crlf->has_held && was_cr) {
+                       lf_to_crlf->has_held = 1;
+                       lf_to_crlf->held = '\r';
+               }
        }
        return 0;
 }