Replace rdline with libbsd fparseln

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>

Makefile.am

@@ -5,7 +5,16 @@ AM_CFLAGS = $(WARN_CFLAGS)
 
 sbin_PROGRAMS = gcrond
 
-gcrond_SOURCES = gcrond.c gcrond.h rdcron.c crontab.c cronscan.c rdline.c
+gcrond_SOURCES = gcrond.c gcrond.h rdcron.c crontab.c cronscan.c
+gcrond_CPPFLAGS = $(AM_CPPFLAGS)
+gcrond_CFLAGS = $(AM_CFLAGS)
+gcrond_LDADD =
+
+if HAVE_LIBBSD
+gcrond_CPPFLAGS += -DHAVE_LIBBSD
+gcrond_CFLAGS += $(LIBBSD_CFLAGS)
+gcrond_LDADD += $(LIBBSD_LIBS)
+endif
 
 crontabdir = @GCRONDIR@
 crontab_DATA = crontab/0-example

configure.ac

@@ -8,6 +8,23 @@ AC_PROG_CC
 AC_PROG_CC_C99
 AC_PROG_INSTALL
 AC_PROG_RANLIB
+AC_CANONICAL_HOST
+
+m4_ifndef([PKG_PROG_PKG_CONFIG],
+  [m4_fatal([Could not locate the pkg-config autoconf
+    macros. These are usually located in /usr/share/aclocal/pkg.m4.
+    If your macros are in a different location, try setting the
+    environment variable AL_OPTS="-I/other/macro/dir" before running
+    ./autogen.sh or autoreconf again. Make sure pkg-config is installed.])])
+PKG_PROG_PKG_CONFIG
+
+case "${host_os}" in
+linux*)
+	AM_CONDITIONAL([HAVE_LIBBSD], [true])
+	PKG_CHECK_MODULES(LIBBSD, [libbsd], [],
+				  [AC_MSG_ERROR([missing libbsd])])
+	;;
+esac
 
 UL_WARN_ADD([-Wall])
 UL_WARN_ADD([-Wextra])

gcrond.h

@@ -21,6 +21,10 @@
 #include <fcntl.h>
 #include <time.h>
 
+#ifdef HAVE_LIBBSD
+#include <bsd/bsd.h>
+#endif
+
 #include "config.h"
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
@@ -43,14 +47,6 @@ typedef struct {
 	char *line;
 } rdline_t;
 
-int rdline_init(rdline_t *t, int dirfd, const char *filename);
-
-void rdline_complain(rdline_t *t, const char *msg, ...);
-
-void rdline_cleanup(rdline_t *t);
-
-int rdline(rdline_t *t);
-
 crontab_t *rdcron(int dirfd, const char *filename);
 
 void delcron(crontab_t *cron);

rdcron.c

@@ -96,6 +96,10 @@ static const struct {
 
 /*****************************************************************************/
 
+#define complainf(rd, msg, ...) \
+	fprintf(stderr, "%s: %zu: " msg "\n", \
+		rd->filename, rd->lineno, __VA_ARGS__)
+
 static char *readnum(char *line, int *out, int minval, int maxval,
 		     const enum_map_t *mnemonic, rdline_t *rd)
 {
@@ -113,7 +117,7 @@ static char *readnum(char *line, int *out, int minval, int maxval,
 		}
 
 		if (ev->name == NULL) {
-			rdline_complain(rd, "unexpected '%.*s'", i, line);
+			complainf(rd, "unexpected '%.*s'", i, line);
 			return NULL;
 		}
 
@@ -138,13 +142,14 @@ static char *readnum(char *line, int *out, int minval, int maxval,
 	*out = value;
 	return line;
 fail_of:
-	rdline_complain(rd, "value exceeds maximum (%d > %d)", value, maxval);
+	complainf(rd, "value exceeds maximum (%d > %d)", value, maxval);
 	return NULL;
 fail_uf:
-	rdline_complain(rd, "value too small (%d < %d)", value, minval);
+	complainf(rd, "value too small (%d < %d)", value, minval);
 	return NULL;
 fail_mn:
-	rdline_complain(rd, "expected numeric value");
+	fprintf(stderr, "%s: %zu: expected numeric value\n",
+		rd->filename, rd->lineno);
 	return NULL;
 }
 
@@ -201,7 +206,8 @@ next:
 
 	return line;
 fail:
-	rdline_complain(rd, "invalid time range expression");
+	fprintf(stderr, "%s: %zu: invalid time range expression\n",
+		rd->filename, rd->lineno);
 	return NULL;
 }
 
@@ -229,7 +235,7 @@ static char *cron_interval(crontab_t *cron, rdline_t *rd)
 	*cron = intervals[i].tab;
 	return rd->line + j;
 fail:
-	rdline_complain(rd, "unknown interval '%.*s'", (int)j, rd->line);
+	complainf(rd, "unknown interval '%.*s'", (int)j, rd->line);
 	return NULL;
 }
 
@@ -266,14 +272,39 @@ crontab_t *rdcron(int dirfd, const char *filename)
 	crontab_t *cron, *list = NULL;
 	rdline_t rd;
 	char *ptr;
+	int fd;
+
+	memset(&rd, 0, sizeof(rd));
+	rd.filename = filename;
+
+	fd = openat(dirfd, filename, O_RDONLY);
+	if (fd == -1) {
+		perror(filename);
+		return NULL;
+	}
 
-	if (rdline_init(&rd, dirfd, filename))
+	rd.fp = fdopen(fd, "r");
+	if (rd.fp == NULL) {
+		perror("fdopen");
+		close(fd);
 		return NULL;
+	}
+
+	for (;;) {
+		free(rd.line);
+		errno = 0;
+
+		rd.line = fparseln(rd.fp, NULL, &rd.lineno, NULL, 0);
+
+		if (rd.line == NULL) {
+			if (errno)
+				perror(filename);
+			break;
+		}
 
-	while (rdline(&rd) == 0) {
 		cron = calloc(1, sizeof(*cron));
 		if (cron == NULL) {
-			rdline_complain(&rd, strerror(errno));
+			perror(filename);
 			break;
 		}
 
@@ -293,7 +324,7 @@ crontab_t *rdcron(int dirfd, const char *filename)
 
 		cron->exec = strdup(ptr);
 		if (cron->exec == NULL) {
-			rdline_complain(&rd, strerror(errno));
+			perror(filename);
 			free(cron);
 			continue;
 		}
@@ -302,6 +333,6 @@ crontab_t *rdcron(int dirfd, const char *filename)
 		list = cron;
 	}
 
-	rdline_cleanup(&rd);
+	fclose(rd.fp);
 	return list;
 }

rdline.c

@@ -1,77 +0,0 @@
-/* SPDX-License-Identifier: ISC */
-#include "gcrond.h"
-
-int rdline(rdline_t *t)
-{
-	size_t i, len;
-
-	do {
-		free(t->line);
-		t->line = NULL;
-		errno = 0;
-		len = 0;
-
-		if (getline(&t->line, &len, t->fp) < 0) {
-			if (errno) {
-				rdline_complain(t, strerror(errno));
-				return -1;
-			}
-			return 1;
-		}
-
-		t->lineno += 1;
-
-		for (i = 0; isspace(t->line[i]); ++i)
-			;
-
-		if (t->line[i] == '\0' || t->line[i] == '#') {
-			t->line[0] = '\0';
-		} else if (i) {
-			memmove(t->line, t->line + i, len - i + 1);
-		}
-	} while (t->line[0] == '\0');
-
-	return 0;
-}
-
-void rdline_complain(rdline_t *t, const char *msg, ...)
-{
-	va_list ap;
-
-	fprintf(stderr, "%s: %zu: ", t->filename, t->lineno);
-
-	va_start(ap, msg);
-	vfprintf(stderr, msg, ap);
-	va_end(ap);
-
-	fputc('\n', stderr);
-}
-
-int rdline_init(rdline_t *t, int dirfd, const char *filename)
-{
-	int fd;
-
-	memset(t, 0, sizeof(*t));
-
-	fd = openat(dirfd, filename, O_RDONLY);
-	if (fd == -1) {
-		perror(filename);
-		return -1;
-	}
-
-	t->fp = fdopen(fd, "r");
-	if (t->fp == NULL) {
-		perror("fdopen");
-		close(fd);
-		return -1;
-	}
-
-	t->filename = filename;
-	return 0;
-}
-
-void rdline_cleanup(rdline_t *t)
-{
-	free(t->line);
-	fclose(t->fp);
-}