Run a command and capture its stdout.

Functions

lf_capture_system

Runs a command through /bin/sh via popen and returns stdout as a heap string. buf_sz is the initial buffer size; 0 uses LF_CAPTURE_SYSTEM_BUFSIZE (1024).

The command string is not sanitized. Do not pass untrusted input; /bin/sh interprets metacharacters.

The caller frees the returned string. Returns NULL if cmd is NULL or on error.

char *lf_capture_system(const char *cmd, size_t buf_sz);

/* Usage */
char *cap = lf_capture_system("ls $HOME", 0);
printf("%s\n", cap);
free(cap);