Move system_argv_* into their own file.

Makefile.am

@@ -5,10 +5,10 @@ ACLOCAL_AMFLAGS = -I m4
 lib_LTLIBRARIES = libwinterop.so.la libmsi.so.la libpreload.la
 
 libwinterop_so_la_SOURCES = fake-winterop.c fake-lib.c fake-lib.h	\
-memory.c memory.h dupstr.c dupstr.h
+memory.c memory.h dupstr.c dupstr.h subproc.c subproc.h
 
-libmsi_so_la_SOURCES = fake-msi.c fake-lib.c fake-lib.h md5.c	\
+libmsi_so_la_SOURCES = fake-msi.c fake-lib.c fake-lib.h md5.c		\
-memory.c memory.h version.c dupstr.c dupstr.h
+memory.c memory.h version.c dupstr.c dupstr.h subproc.c subproc.h
 
 libpreload_la_SOURCES = preload.c
 libpreload_la_LDFLAGS = -ldl

dupstr.h

@@ -1,6 +1,8 @@
 #include <stddef.h>
 
+#ifndef cNULL
 #define cNULL ((const char *)NULL)
+#endif
 
 char *dupstr(const char *str);
 char *dupcat(const char *str, ...);

fake-lib.c

@@ -7,10 +7,6 @@
 #include <uchar.h>
 #include <err.h>
 
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
 #include "memory.h"
 #include "fake-lib.h"
 
@@ -29,54 +25,6 @@ char *ascii(const char16_t *wstr, bool translate_slashes)
     return ret;
 }
 
-void system_argv_array(char **args)
-{
-    pid_t pid = fork();
-    if (pid < 0)
-        err(1, "fork");
-
-    if (pid == 0) {
-        execvp(args[0], args);
-        warn("execvp");
-        _exit(127);
-    }
-
-    int status;
-    if (waitpid(pid, &status, 0) != pid)
-        err(1, "waitpid");
-    if (!(WIFEXITED(status) && WEXITSTATUS(status) == 0))
-        errx(1, "subcommand failed");
-}
-
-void system_argv(const char *cmd, ...)
-{
-    int nargs, nchars;
-    const char *word;
-    va_list ap;
-
-    va_start(ap, cmd);
-    nargs = 1;                         /* terminating NULL */
-    nchars = 0;
-    for (word = cmd; word; word = va_arg(ap, const char *)) {
-        nargs++;
-        nchars += 1 + strlen(word);
-    }
-    va_end(ap);
-
-    char *args[nargs], chars[nchars];
-    char **argp = args, *charp = chars;
-    va_start(ap, cmd);
-    for (word = cmd; word; word = va_arg(ap, const char *)) {
-        *argp++ = charp;
-        strcpy(charp, word);
-        charp += 1 + strlen(word);
-    }
-    va_end(ap);
-    *argp++ = NULL;
-
-    system_argv_array(args);
-}
-
 void c16cpy(char16_t *out, uint32_t *outsize, char *s)
 {
     uint32_t retlen = 0;

fake-lib.h

@@ -2,6 +2,4 @@
 #include <stdlib.h>
 
 char *ascii(const char16_t *wstr, bool translate_slashes);
-void system_argv(const char *cmd, ...);
-void system_argv_array(char **args);
 void c16cpy(char16_t *out, uint32_t *outsize, char *s);

fake-msi.c

@@ -16,6 +16,7 @@
 
 #include "memory.h"
 #include "dupstr.h"
+#include "subproc.h"
 #include "fake-lib.h"
 
 typedef struct MsiTypePrefix {

fake-winterop.c

@@ -13,6 +13,7 @@
 
 #include "memory.h"
 #include "dupstr.h"
+#include "subproc.h"
 #include "fake-lib.h"
 
 uint32_t HashPublicKeyInfo(void *pCertContext,

subproc.c

@@ -0,0 +1,59 @@
+#include <stddef.h>
+#include <stdarg.h>
+#include <string.h>
+#include <err.h>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "subproc.h"
+
+void system_argv_array(char **args)
+{
+    pid_t pid = fork();
+    if (pid < 0)
+        err(1, "fork");
+
+    if (pid == 0) {
+        execvp(args[0], args);
+        warn("execvp");
+        _exit(127);
+    }
+
+    int status;
+    if (waitpid(pid, &status, 0) != pid)
+        err(1, "waitpid");
+    if (!(WIFEXITED(status) && WEXITSTATUS(status) == 0))
+        errx(1, "subcommand failed");
+}
+
+void system_argv(const char *cmd, ...)
+{
+    int nargs, nchars;
+    const char *word;
+    va_list ap;
+
+    va_start(ap, cmd);
+    nargs = 1;                         /* terminating NULL */
+    nchars = 0;
+    for (word = cmd; word; word = va_arg(ap, const char *)) {
+        nargs++;
+        nchars += 1 + strlen(word);
+    }
+    va_end(ap);
+
+    char *args[nargs], chars[nchars];
+    char **argp = args, *charp = chars;
+    va_start(ap, cmd);
+    for (word = cmd; word; word = va_arg(ap, const char *)) {
+        *argp++ = charp;
+        strcpy(charp, word);
+        charp += 1 + strlen(word);
+    }
+    va_end(ap);
+    *argp++ = NULL;
+
+    system_argv_array(args);
+}
+

subproc.h

@@ -0,0 +1,6 @@
+#ifndef cNULL
+#define cNULL ((const char *)NULL)
+#endif
+
+void system_argv(const char *cmd, ...);
+void system_argv_array(char **args);