strbuf: give strbuf_getline() to the "most text friendly" variant

Now there is no direct caller to strbuf_getline(), we can demote it
to file-scope static that is private to strbuf.c and rename it to
strbuf_getdelim().  Rename strbuf_getline_crlf(), which is designed
to be the most "text friendly" variant, and allow it to take over
this simplest name, strbuf_getline(), so we can add more uses of it
without having to type _crlf over and over again in the coming
steps.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/am.c

@@ -613,7 +613,7 @@ static int is_mail(FILE *fp)
 	if (regcomp(&regex, header_regex, REG_NOSUB | REG_EXTENDED))
 		die("invalid pattern: %s", header_regex);
 
-	while (!strbuf_getline_crlf(&sb, fp)) {
+	while (!strbuf_getline(&sb, fp)) {
 		if (!sb.len)
 			break; /* End of header */
 
@@ -660,7 +660,7 @@ static int detect_patch_format(const char **paths)
 
 	fp = xfopen(*paths, "r");
 
-	while (!strbuf_getline_crlf(&l1, fp)) {
+	while (!strbuf_getline(&l1, fp)) {
 		if (l1.len)
 			break;
 	}
@@ -681,9 +681,9 @@ static int detect_patch_format(const char **paths)
 	}
 
 	strbuf_reset(&l2);
-	strbuf_getline_crlf(&l2, fp);
+	strbuf_getline(&l2, fp);
 	strbuf_reset(&l3);
-	strbuf_getline_crlf(&l3, fp);
+	strbuf_getline(&l3, fp);
 
 	/*
 	 * If the second line is empty and the third is a From, Author or Date

strbuf.c

@@ -501,7 +501,7 @@ int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 }
 #endif
 
-int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
+static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
 {
 	if (strbuf_getwholeline(sb, fp, term))
 		return EOF;
@@ -510,7 +510,7 @@ int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 	return 0;
 }
 
-int strbuf_getline_crlf(struct strbuf *sb, FILE *fp)
+int strbuf_getline(struct strbuf *sb, FILE *fp)
 {
 	if (strbuf_getwholeline(sb, fp, '\n'))
 		return EOF;
@@ -524,12 +524,12 @@ int strbuf_getline_crlf(struct strbuf *sb, FILE *fp)
 
 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 {
-	return strbuf_getline(sb, fp, '\n');
+	return strbuf_getdelim(sb, fp, '\n');
 }
 
 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 {
-	return strbuf_getline(sb, fp, '\0');
+	return strbuf_getdelim(sb, fp, '\0');
 }
 
 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)

strbuf.h

@@ -354,8 +354,8 @@ extern void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm
  *
  * NOTE: The buffer is rewound if the read fails. If -1 is returned,
  * `errno` must be consulted, like you would do for `read(3)`.
- * `strbuf_read()`, `strbuf_read_file()` and `strbuf_getline()` has the
- * same behaviour as well.
+ * `strbuf_read()`, `strbuf_read_file()` and `strbuf_getline_*()`
+ * family of functions have the same behaviour as well.
  */
 extern size_t strbuf_fread(struct strbuf *, size_t, FILE *);
 
@@ -379,19 +379,14 @@ extern ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint
 extern int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint);
 
 /**
- * Read a line from a FILE *, overwriting the existing contents
- * of the strbuf. The second argument specifies the line
- * terminator character, typically `'\n'`.
+ * Read a line from a FILE *, overwriting the existing contents of
+ * the strbuf.  The strbuf_getline*() family of functions share
+ * this signature, but have different line termination conventions.
+ *
  * Reading stops after the terminator or at EOF.  The terminator
  * is removed from the buffer before returning.  Returns 0 unless
  * there was nothing left before EOF, in which case it returns `EOF`.
  */
-extern int strbuf_getline(struct strbuf *, FILE *, int);
-
-/**
- * The strbuf_getline*() family of functions share this signature, but
- * have different line termination conventions.
- */
 typedef int (*strbuf_getline_fn)(struct strbuf *, FILE *);
 
 /* Uses LF as the line terminator */
@@ -403,8 +398,11 @@ extern int strbuf_getline_nul(struct strbuf *sb, FILE *fp);
 /*
  * Similar to strbuf_getline_lf(), but additionally treats a CR that
  * comes immediately before the LF as part of the terminator.
+ * This is the most friendly version to be used to read "text" files
+ * that can come from platforms whose native text format is CRLF
+ * terminated.
  */
-extern int strbuf_getline_crlf(struct strbuf *, FILE *);
+extern int strbuf_getline(struct strbuf *, FILE *);
 
 
 /**

transport-helper.c

@@ -137,7 +137,8 @@ static struct child_process *get_helper(struct transport *transport)
 	data->no_disconnect_req = 0;
 
 	/*
-	 * Open the output as FILE* so strbuf_getline() can be used.
+	 * Open the output as FILE* so strbuf_getline_*() family of
+	 * functions can be used.
 	 * Do this with duped fd because fclose() will close the fd,
 	 * and stuff like taking over will require the fd to remain.
 	 */