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, 32 insertions, 0 deletions

diff --git a/src/libenvexec/envalloc_uniq.c b/src/libenvexec/envalloc_uniq.c
new file mode 100644
index 0000000..cf60b44
--- /dev/null
+++ b/src/libenvexec/envalloc_uniq.c
@@ -0,0 +1,32 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/envalloc.h>
+
+int envalloc_uniq (genalloc *v, char delim)
+{
+  unsigned int m = 0 ;
+  size_t i = 0 ;
+  for (; i < genalloc_len(char const *, v) ; i++)
+  {
+    size_t j = i+1 ;
+    char const *s = genalloc_s(char const *, v)[i] ;
+    size_t n = str_chr(s, delim) ;
+    if (delim && !s[n]) return (errno = EINVAL, -1) ;
+    for (; j < genalloc_len(char const *, v) ; j++)
+    {
+      char const **p = genalloc_s(char const *, v) ;
+      if (!strncmp(s, p[j], n))
+      {
+        size_t len = genalloc_len(char const *, v) - 1 ;
+        genalloc_setlen(char const *, v, len) ;
+        p[j] = p[len] ;
+        m++ ;
+      }
+    }
+  }
+  return m ;
+}