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// makeCWrapper /path/to/executable \
--suffix PATH : /usr/bin/ \
--suffix PATH : /usr/local/bin/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
char *concat3(char *x, char *y, char *z) {
int xn = strlen(x);
int yn = strlen(y);
int zn = strlen(z);
char *res = malloc(sizeof(*res)*(xn + yn + zn + 1));
assert(res != NULL);
strncpy(res, x, xn);
strncpy(res + xn, y, yn);
strncpy(res + xn + yn, z, zn);
res[xn + yn + zn] = '\0';
return res;
}
void set_env_suffix(char *env, char *sep, char *val) {
char *existing = getenv(env);
if (existing) val = concat3(existing, sep, val);
setenv(env, val, 1);
if (existing) free(val);
}
int main(int argc, char **argv) {
set_env_suffix("PATH", ":", "/usr/bin/");
set_env_suffix("PATH", ":", "/usr/local/bin/");
argv[0] = "/path/to/executable";
return execv("/path/to/executable", argv);
}
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