QPDFJob: let initializeFromArgv just take argv, not argc

Let argv be a null-terminated array. There is already code that
assumes this, and it makes it easier to construct the arguments.

8 files changed, 49 insertions, 35 deletions

diff --git a/examples/qpdf-job.cc b/examples/qpdf-job.cc
index d1760897..29f23a34 100644
--- a/examples/qpdf-job.cc
+++ b/examples/qpdf-job.cc
@@ -82,7 +82,7 @@ int main(int argc, char* argv[])
             nullptr
         };
         QPDFJob j;
-        j.initializeFromArgv(9, new_argv);
+        j.initializeFromArgv(new_argv);
         j.run();
         std::cout << "out2 status: " << j.getExitCode() << std::endl;
     }
diff --git a/examples/qpdfjob-c.c b/examples/qpdfjob-c.c
index da53001a..ac58b8ae 100644
--- a/examples/qpdfjob-c.c
+++ b/examples/qpdfjob-c.c
@@ -57,6 +57,6 @@ int main(int argc, char* argv[])
      * qpdfjob_run_from_json instead and pass the json string as a
      * single char const* argument.
      */
-    r = qpdfjob_run_from_argv(5, new_argv);
+    r = qpdfjob_run_from_argv(new_argv);
     return r;
 }
diff --git a/include/qpdf/QPDFJob.hh b/include/qpdf/QPDFJob.hh
index 44ec723c..df51828b 100644
--- a/include/qpdf/QPDFJob.hh
+++ b/include/qpdf/QPDFJob.hh
@@ -57,27 +57,28 @@ class QPDFJob
 
     // SETUP FUNCTIONS
 
-    // Initialize a QPDFJob object from argv. The progname_env
-    // argument is the name of an environment variable which, if set,
-    // overrides the name of the executable for purposes of generating
-    // the --completion options. See QPDFArgParser for details. If a
-    // null pointer is passed in, the default value of
-    // "QPDF_EXECUTABLE" is used. This is used by the QPDF cli, which
-    // just initializes a QPDFJob from argv, calls run(), and handles
-    // errors and exit status issues. You can perform much of the cli
-    // functionality programmatically in this way rather than using
-    // the regular API. This is exposed in the C API, which makes it
-    // easier to get certain high-level qpdf functionality from other
-    // languages. If there are any command-line errors, this method
-    // will throw QPDFUsage which is derived from std::runtime_error.
-    // Other exceptions may be thrown in some cases. Note that argc,
-    // and argv should be UTF-8 encoded. If you are calling this from
-    // a Windows Unicode-aware main (wmain), see
-    // QUtil::call_main_from_wmain for information about converting
-    // arguments to UTF-8. This method will mutate arguments that are
-    // passed to it.
+    // Initialize a QPDFJob object from argv, which must be a
+    // null-terminated array of null-terminated UTF-8-encoded C
+    // strings. The progname_env argument is the name of an
+    // environment variable which, if set, overrides the name of the
+    // executable for purposes of generating the --completion options.
+    // See QPDFArgParser for details. If a null pointer is passed in,
+    // the default value of "QPDF_EXECUTABLE" is used. This is used by
+    // the QPDF cli, which just initializes a QPDFJob from argv, calls
+    // run(), and handles errors and exit status issues. You can
+    // perform much of the cli functionality programmatically in this
+    // way rather than using the regular API. This is exposed in the C
+    // API, which makes it easier to get certain high-level qpdf
+    // functionality from other languages. If there are any
+    // command-line errors, this method will throw QPDFUsage which is
+    // derived from std::runtime_error. Other exceptions may be thrown
+    // in some cases. Note that argc, and argv should be UTF-8
+    // encoded. If you are calling this from a Windows Unicode-aware
+    // main (wmain), see QUtil::call_main_from_wmain for information
+    // about converting arguments to UTF-8. This method will mutate
+    // arguments that are passed to it.
     QPDF_DLL
-    void initializeFromArgv(int argc, char const* const argv[],
+    void initializeFromArgv(char const* const argv[],
                             char const* progname_env = nullptr);
 
     // Initialize a QPDFJob from json. Passing partial = true prevents
diff --git a/include/qpdf/qpdfjob-c.h b/include/qpdf/qpdfjob-c.h
index 3fc3ec30..0a390877 100644
--- a/include/qpdf/qpdfjob-c.h
+++ b/include/qpdf/qpdfjob-c.h
@@ -47,12 +47,12 @@ extern "C" {
 #endif
     /* This function does the equivalent of running the qpdf
      * command-line with the given arguments and returns the exit code
-     * that qpdf would use. Note that arguments must be UTF8-encoded.
-     * If calling this from wmain on Windows, use
-     * qpdfjob_run_from_wide_argv instead.
+     * that qpdf would use. argv must be a null-terminated array of
+     * null-terminated UTF8-encoded strings. If calling this from
+     * wmain on Windows, use qpdfjob_run_from_wide_argv instead.
      */
     QPDF_DLL
-    int qpdfjob_run_from_argv(int argc, char const* const argv[]);
+    int qpdfjob_run_from_argv(char const* const argv[]);
 
 #ifndef QPDF_NO_WCHAR_T
     /* This function is the same as qpdfjob_run_from_argv except argv
@@ -60,7 +60,7 @@ extern "C" {
      * calling from a Windows wmain function.
      */
     QPDF_DLL
-    int qpdfjob_run_from_wide_argv(int argc, wchar_t const* const argv[]);
+    int qpdfjob_run_from_wide_argv(wchar_t const* const argv[]);
 #endif /* QPDF_NO_WCHAR_T */
 
     /* This function runs QPDFJob from a job JSON file. See the "QPDF
diff --git a/libqpdf/QPDFJob_argv.cc b/libqpdf/QPDFJob_argv.cc
index e2870309..e3d4a47b 100644
--- a/libqpdf/QPDFJob_argv.cc
+++ b/libqpdf/QPDFJob_argv.cc
@@ -465,13 +465,18 @@ ArgParser::parseOptions()
 }
 
 void
-QPDFJob::initializeFromArgv(int argc, char const* const argv[],
+QPDFJob::initializeFromArgv(char const* const argv[],
                             char const* progname_env)
 {
     if (progname_env == nullptr)
     {
         progname_env = "QPDF_EXECUTABLE";
     }
+    int argc = 0;
+    for (auto k = argv; *k; ++k)
+    {
+        ++argc;
+    }
     QPDFArgParser qap(argc, argv, progname_env);
     setMessagePrefix(qap.getProgname());
     ArgParser ap(qap, config());
diff --git a/libqpdf/qpdfjob-c.cc b/libqpdf/qpdfjob-c.cc
index e1c76477..10e13043 100644
--- a/libqpdf/qpdfjob-c.cc
+++ b/libqpdf/qpdfjob-c.cc
@@ -7,7 +7,7 @@
 #include <cstdio>
 #include <cstring>
 
-int qpdfjob_run_from_argv(int argc, char const* const argv[])
+int qpdfjob_run_from_argv(char const* const argv[])
 {
     auto whoami_p = QUtil::make_shared_cstr(argv[0]);
     auto whoami = QUtil::getWhoami(whoami_p.get());
@@ -16,7 +16,7 @@ int qpdfjob_run_from_argv(int argc, char const* const argv[])
     QPDFJob j;
     try
     {
-        j.initializeFromArgv(argc, argv);
+        j.initializeFromArgv(argv);
         j.run();
     }
     catch (std::exception& e)
@@ -28,9 +28,17 @@ int qpdfjob_run_from_argv(int argc, char const* const argv[])
 }
 
 #ifndef QPDF_NO_WCHAR_T
-int qpdfjob_run_from_wide_argv(int argc, wchar_t const* const argv[])
+int qpdfjob_run_from_wide_argv(wchar_t const* const argv[])
 {
-    return QUtil::call_main_from_wmain(argc, argv, qpdfjob_run_from_argv);
+    int argc = 0;
+    for (auto k = argv; *k; ++k)
+    {
+        ++argc;
+    }
+    return QUtil::call_main_from_wmain(
+        argc, argv, [](int, char const* const new_argv[]) {
+            return qpdfjob_run_from_argv(new_argv);
+        });
 }
 #endif // QPDF_NO_WCHAR_T
 
diff --git a/qpdf/qpdf.cc b/qpdf/qpdf.cc
index d2c576a4..b6805691 100644
--- a/qpdf/qpdf.cc
+++ b/qpdf/qpdf.cc
@@ -43,7 +43,7 @@ int realmain(int argc, char* argv[])
     try
     {
         // See "HOW TO ADD A COMMAND-LINE ARGUMENT" in README-maintainer.
-        j.initializeFromArgv(argc, argv);
+        j.initializeFromArgv(argv);
         j.run();
     }
     catch (QPDFUsage& e)
diff --git a/qpdf/qpdfjob-ctest.c b/qpdf/qpdfjob-ctest.c
index 73605f8a..43935333 100644
--- a/qpdf/qpdfjob-ctest.c
+++ b/qpdf/qpdfjob-ctest.c
@@ -13,7 +13,7 @@ static void wide_test()
     argv[2] = L"a.pdf";
     argv[3] = L"--static-id";
     argv[4] = NULL;
-    assert(qpdfjob_run_from_wide_argv(4, argv) == 0);
+    assert(qpdfjob_run_from_wide_argv(argv) == 0);
     printf("wide test passed\n");
 }
 #endif // QPDF_NO_WCHAR_T
@@ -28,7 +28,7 @@ static void run_tests()
     argv[2] = "a.pdf";
     argv[3] = "--deterministic-id";
     argv[4] = NULL;
-    assert(qpdfjob_run_from_argv(4, argv) == 0);
+    assert(qpdfjob_run_from_argv(argv) == 0);
     printf("argv test passed\n");
 
     assert(qpdfjob_run_from_json("{\n\