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