Complete revamp of the pathexec functions

- pathexec_run is now called exec_ae
    a for provided file name (default: argv[0])
    e for provided envp (default: environ)
- pathexec is now called mexec. m for merge environment. Option letters are:
    a for provided file name (default: argv[0])
    e for provided envp (default: environ)
    f for provided envp *and* length of the envp
    m for provided modif string plus its length (the length is always needed
because the modifs are null-terminated)
    n for provided modif string, length *and* number of modifs
- functions have a foo0 version for _exit(0) when argv[0] is null
- functions have a xfoo version to die if the exec fails
- and a xfoo0
- Compatibility #defines and #includes are there until the next major bump

1 files changed, 10 insertions, 0 deletions

diff --git a/src/libenvexec/envalloc_0.c b/src/libenvexec/envalloc_0.c
new file mode 100644
index 0000000..114f69e
--- /dev/null
+++ b/src/libenvexec/envalloc_0.c
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#include <skalibs/genalloc.h>
+#include <skalibs/envalloc.h>
+
+int envalloc_0 (genalloc *v)
+{
+  char const *z = 0 ;
+  return genalloc_append(char const *, v, &z) ;
+}