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, 17 insertions, 0 deletions

diff --git a/src/libenvexec/env_get2.c b/src/libenvexec/env_get2.c
new file mode 100644
index 0000000..5909ea6
--- /dev/null
+++ b/src/libenvexec/env_get2.c
@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#include <string.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/env.h>
+
+char const *env_get2 (char const *const *envp, char const *s)
+{
+  size_t len, i ;
+  if (!s) return 0 ;
+  len = strlen(s) ;
+  for (i = 0 ; envp[i] ; ++i)
+    if (str_start(envp[i], s)
+     && (envp[i][len] == '='))
+      return envp[i] + len + 1 ;
+  return 0 ;
+}