t9001: style modernisation phase #5

diff --git a/wrapper.c b/wrapper.c
index bc1bfb86003cb4133cc4ce3ce6423ce780ed7c84..007ec0d8eac529579cc00b14f9baaddb7ac68487 100644 (file)
--- a/wrapper.c
+++ b/wrapper.c
@@ -9,16 +9,24 @@ static void do_nothing(size_t size)
 
 static void (*try_to_free_routine)(size_t size) = do_nothing;
 
-static void memory_limit_check(size_t size)
+static int memory_limit_check(size_t size, int gentle)
 {
-       static int limit = -1;
-       if (limit == -1) {
-               const char *env = getenv("GIT_ALLOC_LIMIT");
-               limit = env ? atoi(env) * 1024 : 0;
+       static size_t limit = 0;
+       if (!limit) {
+               limit = git_env_ulong("GIT_ALLOC_LIMIT", 0);
+               if (!limit)
+                       limit = SIZE_MAX;
        }
-       if (limit && size > limit)
-               die("attempting to allocate %"PRIuMAX" over limit %d",
-                   (intmax_t)size, limit);
+       if (size > limit) {
+               if (gentle) {
+                       error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+                             (uintmax_t)size, (uintmax_t)limit);
+                       return -1;
+               } else
+                       die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+                           (uintmax_t)size, (uintmax_t)limit);
+       }
+       return 0;
 }
 
 try_to_free_t set_try_to_free_routine(try_to_free_t routine)
@@ -42,11 +50,12 @@ char *xstrdup(const char *str)
        return ret;
 }
 
-void *xmalloc(size_t size)
+static void *do_xmalloc(size_t size, int gentle)
 {
        void *ret;
 
-       memory_limit_check(size);
+       if (memory_limit_check(size, gentle))
+               return NULL;
        ret = malloc(size);
        if (!ret && !size)
                ret = malloc(1);
@@ -55,9 +64,16 @@ void *xmalloc(size_t size)
                ret = malloc(size);
                if (!ret && !size)
                        ret = malloc(1);
-               if (!ret)
-                       die("Out of memory, malloc failed (tried to allocate %lu bytes)",
-                           (unsigned long)size);
+               if (!ret) {
+                       if (!gentle)
+                               die("Out of memory, malloc failed (tried to allocate %lu bytes)",
+                                   (unsigned long)size);
+                       else {
+                               error("Out of memory, malloc failed (tried to allocate %lu bytes)",
+                                     (unsigned long)size);
+                               return NULL;
+                       }
+               }
        }
 #ifdef XMALLOC_POISON
        memset(ret, 0xA5, size);
@@ -65,16 +81,37 @@ void *xmalloc(size_t size)
        return ret;
 }
 
-void *xmallocz(size_t size)
+void *xmalloc(size_t size)
+{
+       return do_xmalloc(size, 0);
+}
+
+static void *do_xmallocz(size_t size, int gentle)
 {
        void *ret;
-       if (unsigned_add_overflows(size, 1))
-               die("Data too large to fit into virtual memory space.");
-       ret = xmalloc(size + 1);
-       ((char*)ret)[size] = 0;
+       if (unsigned_add_overflows(size, 1)) {
+               if (gentle) {
+                       error("Data too large to fit into virtual memory space.");
+                       return NULL;
+               } else
+                       die("Data too large to fit into virtual memory space.");
+       }
+       ret = do_xmalloc(size + 1, gentle);
+       if (ret)
+               ((char*)ret)[size] = 0;
        return ret;
 }
 
+void *xmallocz(size_t size)
+{
+       return do_xmallocz(size, 0);
+}
+
+void *xmallocz_gently(size_t size)
+{
+       return do_xmallocz(size, 1);
+}
+
 /*
  * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
  * "data" to the allocated memory, zero terminates the allocated memory,
@@ -96,7 +133,7 @@ void *xrealloc(void *ptr, size_t size)
 {
        void *ret;
 
-       memory_limit_check(size);
+       memory_limit_check(size, 0);
        ret = realloc(ptr, size);
        if (!ret && !size)
                ret = realloc(ptr, 1);
@@ -115,7 +152,7 @@ void *xcalloc(size_t nmemb, size_t size)
 {
        void *ret;
 
-       memory_limit_check(size * nmemb);
+       memory_limit_check(size * nmemb, 0);
        ret = calloc(nmemb, size);
        if (!ret && (!nmemb || !size))
                ret = calloc(1, 1);
@@ -429,17 +466,29 @@ int xmkstemp_mode(char *template, int mode)
 
 static int warn_if_unremovable(const char *op, const char *file, int rc)
 {
-       if (rc < 0) {
-               int err = errno;
-               if (ENOENT != err) {
-                       warning("unable to %s %s: %s",
-                               op, file, strerror(errno));
-                       errno = err;
-               }
-       }
+       int err;
+       if (!rc || errno == ENOENT)
+               return 0;
+       err = errno;
+       warning("unable to %s %s: %s", op, file, strerror(errno));
+       errno = err;
        return rc;
 }
 
+int unlink_or_msg(const char *file, struct strbuf *err)
+{
+       int rc = unlink(file);
+
+       assert(err);
+
+       if (!rc || errno == ENOENT)
+               return 0;
+
+       strbuf_addf(err, "unable to unlink %s: %s",
+                   file, strerror(errno));
+       return -1;
+}
+
 int unlink_or_warn(const char *file)
 {
        return warn_if_unremovable("unlink", file, unlink(file));
@@ -493,3 +542,11 @@ struct passwd *xgetpwuid_self(void)
                    errno ? strerror(errno) : _("no such user"));
        return pw;
 }
+
+char *xgetcwd(void)
+{
+       struct strbuf sb = STRBUF_INIT;
+       if (strbuf_getcwd(&sb))
+               die_errno(_("unable to get current working directory"));
+       return strbuf_detach(&sb, NULL);
+}