diff options
| -rw-r--r-- | cbs.h | 45 |
1 files changed, 45 insertions, 0 deletions
@@ -209,6 +209,16 @@ static int cmdwait(pid_t); static void cmdput(cmd_t); static void cmdputf(FILE *, cmd_t); +/* Expand the environment variable s using /bin/sh expansion rules and store the + results in the given string vector. If the environment variable is NULL or + empty, then store the strings specified by the array p of length n. + + env_or_default() is the same as env_or_defaultv() but you provide p as + variadic arguments. */ +static void env_or_defaultv(struct strv *, const char *s, char **p, size_t n); +#define env_or_default(sv, s, ...) \ + env_or_defaultv((sv), (s), _vtoa(__VA_ARGS__), lengthof(_vtoa(__VA_ARGS__))) + /* Returns if a file exists at the given path. A return value of false may also mean you don’t have the proper file access permissions, which will also set errno. */ @@ -586,6 +596,41 @@ cmdputf(FILE *stream, cmd_t cmd) funlockfile(stream); } +void +env_or_defaultv(struct strv *sv, const char *s, char **p, size_t n) +{ + wordexp_t we; + const char *ev; + + if ((ev = getenv(s)) && *ev) { + switch (wordexp(ev, &we, WRDE_NOCMD)) { + case WRDE_BADCHAR: + case WRDE_BADVAL: + case WRDE_SYNTAX: + errno = EINVAL; + die("wordexp"); + case WRDE_NOSPACE: + errno = ENOMEM; + die("wordexp"); + } + + sv->buf = bufalloc(NULL, we.we_wordc, sizeof(*sv->buf)); + for (size_t i = 0; i < we.we_wordc; i++) { + if (!(sv->buf[i] = strdup(we.we_wordv[i]))) + die("strdup"); + } + sv->len = we.we_wordc; + wordfree(&we); + } else { + sv->buf = bufalloc(NULL, n, sizeof(*sv->buf)); + for (size_t i = 0; i < n; i++) { + if (!(sv->buf[i] = strdup(p[i]))) + die("strdup"); + } + sv->len = n; + } +} + bool fexists(const char *f) { |