[PATCH v18 04/15] windows: common wrapper for vasprintf and asprintf

[Stephen Hemminger <stephen@networkplumber.org>]

Replace the windows version of asprintf() that was only usable
in eal. With a more generic one that supports both vasprintf()
and asprintf().  This also eliminates duplicate code.

Fixes: 8f4de2dba9b9 ("bus/pci: fill bus specific information")
Fixes: 9ec521006db0 ("eal/windows: hide asprintf shim")

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 drivers/bus/pci/pci_common.c          | 32 ------------------
 lib/eal/common/eal_private.h          | 10 ------
 lib/eal/windows/eal.c                 | 28 ----------------
 lib/eal/windows/include/rte_os_shim.h | 48 +++++++++++++++++++++++++++
 4 files changed, 48 insertions(+), 70 deletions(-)

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index 889a48d2af..80691c75a3 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -45,38 +45,6 @@ const char *rte_pci_get_sysfs_path(void)
 	return path;
 }
 
-#ifdef RTE_EXEC_ENV_WINDOWS
-#define asprintf pci_asprintf
-
-static int
-__rte_format_printf(2, 3)
-pci_asprintf(char **buffer, const char *format, ...)
-{
-	int size, ret;
-	va_list arg;
-
-	va_start(arg, format);
-	size = vsnprintf(NULL, 0, format, arg);
-	va_end(arg);
-	if (size < 0)
-		return -1;
-	size++;
-
-	*buffer = malloc(size);
-	if (*buffer == NULL)
-		return -1;
-
-	va_start(arg, format);
-	ret = vsnprintf(*buffer, size, format, arg);
-	va_end(arg);
-	if (ret != size - 1) {
-		free(*buffer);
-		return -1;
-	}
-	return ret;
-}
-#endif /* RTE_EXEC_ENV_WINDOWS */
-
 static struct rte_devargs *
 pci_devargs_lookup(const struct rte_pci_addr *pci_addr)
 {
diff --git a/lib/eal/common/eal_private.h b/lib/eal/common/eal_private.h
index 71523cfdb8..da8d77a134 100644
--- a/lib/eal/common/eal_private.h
+++ b/lib/eal/common/eal_private.h
@@ -737,16 +737,6 @@ void __rte_thread_init(unsigned int lcore_id, rte_cpuset_t *cpuset);
  */
 void __rte_thread_uninit(void);
 
-/**
- * asprintf(3) replacement for Windows.
- */
-#ifdef RTE_EXEC_ENV_WINDOWS
-__rte_format_printf(2, 3)
-int eal_asprintf(char **buffer, const char *format, ...);
-
-#define asprintf(buffer, format, ...) \
-		eal_asprintf(buffer, format, ##__VA_ARGS__)
-#endif
 
 #define EAL_LOG(level, ...) \
 	RTE_LOG_LINE(level, EAL, "" __VA_ARGS__)
diff --git a/lib/eal/windows/eal.c b/lib/eal/windows/eal.c
index 52f0e7462d..8ca00c0f95 100644
--- a/lib/eal/windows/eal.c
+++ b/lib/eal/windows/eal.c
@@ -503,34 +503,6 @@ rte_eal_init(int argc, char **argv)
 	return fctret;
 }
 
-/* Don't use MinGW asprintf() to have identical code with all toolchains. */
-int
-eal_asprintf(char **buffer, const char *format, ...)
-{
-	int size, ret;
-	va_list arg;
-
-	va_start(arg, format);
-	size = vsnprintf(NULL, 0, format, arg);
-	va_end(arg);
-	if (size < 0)
-		return -1;
-	size++;
-
-	*buffer = malloc(size);
-	if (*buffer == NULL)
-		return -1;
-
-	va_start(arg, format);
-	ret = vsnprintf(*buffer, size, format, arg);
-	va_end(arg);
-	if (ret != size - 1) {
-		free(*buffer);
-		return -1;
-	}
-	return ret;
-}
-
 int
 rte_vfio_container_dma_map(__rte_unused int container_fd,
 			__rte_unused uint64_t vaddr,
diff --git a/lib/eal/windows/include/rte_os_shim.h b/lib/eal/windows/include/rte_os_shim.h
index e9741a9df2..65153fdb38 100644
--- a/lib/eal/windows/include/rte_os_shim.h
+++ b/lib/eal/windows/include/rte_os_shim.h
@@ -3,6 +3,7 @@
 #ifndef _RTE_OS_SHIM_
 #define _RTE_OS_SHIM_
 
+#include <stdio.h>
 #include <time.h>
 
 #include <rte_os.h>
@@ -120,4 +121,51 @@ rte_localtime_r(const time_t *timer, struct tm *buf)
 }
 #define localtime_r(timer, buf) rte_localtime_r(timer, buf)
 
+/* print to allocated string */
+__rte_format_printf(2, 0)
+static inline int
+rte_vasprintf(char **strp, const char *fmt, va_list ap)
+{
+	char *str;
+	int len, ret;
+
+	*strp = NULL;
+
+	/* determine size of buffer needed */
+	len = _vscprintf(fmt, ap);
+	if (len < 0)
+		return -1;
+
+	len += 1;	/* for nul termination */
+	str = malloc(len);
+	if (str == NULL)
+		return -1;
+
+	ret = vsnprintf(str, len, fmt, ap);
+	if (ret < 0) {
+		free(str);
+		return -1;
+	} else {
+		*strp = str;
+		return ret;
+	}
+}
+#define vasprintf(strp, fmt, ap) rte_vasprintf(strp, fmt, ap)
+
+__rte_format_printf(2, 3)
+static inline int
+rte_asprintf(char **strp, const char *fmt, ...)
+{
+	int ret;
+
+	va_list ap;
+
+	va_start(ap, fmt);
+	ret = rte_vasprintf(strp, fmt, ap);
+	va_end(ap);
+
+	return ret;
+}
+
+#define asprintf(strp, fmt, ...) rte_asprintf(strp, fmt, __VA_ARGS__)
 #endif /* _RTE_OS_SHIM_ */
-- 
2.43.0