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, 18 insertions, 0 deletions

diff --git a/src/libenvexec/envalloc_make.c b/src/libenvexec/envalloc_make.c
new file mode 100644
index 0000000..f8c459a
--- /dev/null
+++ b/src/libenvexec/envalloc_make.c
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#include <skalibs/env.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/envalloc.h>
+
+int envalloc_make (genalloc *v, size_t argc, char const *s, size_t len)
+{
+  int wasnull = !v->s ;
+  if (!genalloc_readyplus(char const *, v, argc+1)) return 0 ;
+  if (!env_make(genalloc_s(char const *, v) + genalloc_len(char const *, v), argc, s, len))
+  {
+    if (wasnull) genalloc_free(char const *, v) ;
+    return 0 ;
+  }
+  genalloc_setlen(char const *, v, genalloc_len(char const *, v) + argc) ;
+  return 1 ;
+}