cal: support abbreviated month names

Signed-off-by: Karel Zak <kzak@redhat.com>

2 files changed, 21 insertions, 4 deletions

diff --git a/misc-utils/cal.1 b/misc-utils/cal.1
index 39378cfe2a..162916fe97 100644
--- a/misc-utils/cal.1
+++ b/misc-utils/cal.1
@@ -50,8 +50,8 @@ cal \- display a calendar
 displays a simple calendar.  If no arguments are specified, the current
 month is displayed.
 .sp
-The \fImonth\fR may be specified as a number (1-12) or as a month name according
-to the current locales.
+The \fImonth\fR may be specified as a number (1-12), as a month name or as an
+abbreviated month name according to the current locales.
 .SH OPTIONS
 .TP
 \fB\-1\fR, \fB\-\-one\fR
@@ -104,7 +104,7 @@ Specifies the \fIyear\fR to be displayed; note the year must be fully specified:
 will not display a calendar for 1989.
 .TP
 \fBSingle string parameter (e.g. 'cal tomorrow' or 'cal August')\fR
-Specifies \fItimestamp\fR or a \fImonth name\fR according to the current
+Specifies \fItimestamp\fR or a \fImonth name\fR (or abbreviated name) according to the current
 locales.
 .sp
 The special placeholders are accepted when parsing timestamp, "now" may be used
diff --git a/misc-utils/cal.c b/misc-utils/cal.c
index 5c56e74805..5e7b356c8f 100644
--- a/misc-utils/cal.c
+++ b/misc-utils/cal.c
@@ -203,6 +203,8 @@ struct cal_request {
 
 struct cal_control {
 	const char *full_month[MONTHS_IN_YEAR];	/* month names */
+	const char *abbr_month[MONTHS_IN_YEAR];	/* abbreviated month names */
+
 	int colormode;			/* day and week number highlight */
 	int num_months;			/* number of requested monts */
 	int span_months;		/* span the date */
@@ -548,16 +550,31 @@ static void init_monthnames(struct cal_control *ctl)
 		ctl->full_month[i] = nl_langinfo(MON_1 + i);
 }
 
+static void init_abbr_monthnames(struct cal_control *ctl)
+{
+	size_t i;
+
+	if (ctl->abbr_month[0] != '\0')
+		return;		/* already initialized */
+
+	for (i = 0; i < MONTHS_IN_YEAR; i++)
+		ctl->abbr_month[i] = nl_langinfo(ABMON_1 + i);
+}
+
 static int monthname_to_number(struct cal_control *ctl, const char *name)
 {
 	size_t i;
 
 	init_monthnames(ctl);
-
 	for (i = 0; i < MONTHS_IN_YEAR; i++)
 		if (strcasecmp(ctl->full_month[i], name) == 0)
 			return i + 1;
 
+	init_abbr_monthnames(ctl);
+	for (i = 0; i < MONTHS_IN_YEAR; i++)
+		if (strcasecmp(ctl->abbr_month[i], name) == 0)
+			return i + 1;
+
 	return -EINVAL;
 }