xread/xwrite: clip MAX_IO_SIZE to SSIZE_MAX

diff --git a/usage.c b/usage.c
index 8eab28113a970a3f1bc7b9b430aa50341c2667e2..ed146453cabeb9e82bef0c5610cda47d1b2a0b1c 100644 (file)
--- a/usage.c
+++ b/usage.c
@@ -6,8 +6,6 @@
 #include "git-compat-util.h"
 #include "cache.h"
 
-static int dying;
-
 void vreportf(const char *prefix, const char *err, va_list params)
 {
        char msg[4096];
@@ -49,12 +47,19 @@ static void warn_builtin(const char *warn, va_list params)
        vreportf("warning: ", warn, params);
 }
 
+static int die_is_recursing_builtin(void)
+{
+       static int dying;
+       return dying++;
+}
+
 /* If we are in a dlopen()ed .so write to a global variable would segfault
  * (ugh), so keep things static. */
 static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
 static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
 static void (*error_routine)(const char *err, va_list params) = error_builtin;
 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
+static int (*die_is_recursing)(void) = die_is_recursing_builtin;
 
 void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
 {
@@ -66,6 +71,11 @@ void set_error_routine(void (*routine)(const char *err, va_list params))
        error_routine = routine;
 }
 
+void set_die_is_recursing_routine(int (*routine)(void))
+{
+       die_is_recursing = routine;
+}
+
 void NORETURN usagef(const char *err, ...)
 {
        va_list params;
@@ -84,11 +94,10 @@ void NORETURN die(const char *err, ...)
 {
        va_list params;
 
-       if (dying) {
+       if (die_is_recursing()) {
                fputs("fatal: recursion detected in die handler\n", stderr);
                exit(128);
        }
-       dying = 1;
 
        va_start(params, err);
        die_routine(err, params);
@@ -102,12 +111,11 @@ void NORETURN die_errno(const char *fmt, ...)
        char str_error[256], *err;
        int i, j;
 
-       if (dying) {
+       if (die_is_recursing()) {
                fputs("fatal: recursion detected in die_errno handler\n",
                        stderr);
                exit(128);
        }
-       dying = 1;
 
        err = strerror(errno);
        for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
@@ -130,6 +138,7 @@ void NORETURN die_errno(const char *fmt, ...)
        va_end(params);
 }
 
+#undef error
 int error(const char *err, ...)
 {
        va_list params;