| 77,11 → 77,13 |
|---|
| */ |
| size_t cli_redup(char **s1, const char *s2) |
| { |
| size_t len = strlen(s2) + 1; |
| size_t len; |
| |
| if (! len) |
| if (s2 == NULL) |
| return -1; |
| |
| len = strlen(s2) + 1; |
| |
| *s1 = realloc(*s1, len); |
| |
| if (*s1 == NULL) { |
| 89,106 → 91,14 |
|---|
| return -1; |
| } |
| |
| memset(*s1, 0, sizeof(*s1)); |
| *s1[len] = '\0'; |
| |
| memcpy(*s1, s2, len); |
| cli_errno = CL_EOK; |
| |
| return len; |
| } |
| |
| /* An asprintf() for formatting paths, similar to asprintf() but ensures |
| * the returned allocated string is <= PATH_MAX. On failure, an attempt |
| * is made to return the original string (if not null) unmodified. |
| * |
| * Returns: Length of the new string on success, 0 if the string was handed |
| * back unmodified, -1 on failure. On failure, cli_errno is set. |
| * |
| * We do not use POSIX_PATH_MAX, as it is typically much smaller than the |
| * PATH_MAX defined by the kernel. |
| * |
| * Use this like: |
| * if (1 > cli_psprintf(&char, "%s/%s", foo, bar)) { |
| * cli_error(cli_errno, "Failed to format path"); |
| * stop_what_your_doing_as_your_out_of_memory(); |
| * } |
| */ |
| |
| int cli_psprintf(char **s1, const char *fmt, ...) |
| { |
| va_list ap; |
| size_t needed, base = PATH_MAX + 1; |
| int skipped = 0; |
| char *orig = NULL; |
| char *tmp = (char *) malloc(base); |
| |
| /* Don't even touch s1, not enough memory */ |
| if (NULL == tmp) { |
| cli_errno = CL_ENOMEM; |
| return -1; |
| } |
| |
| /* If re-allocating s1, save a copy in case we fail */ |
| if (NULL != *s1) |
| orig = cli_strdup(*s1); |
| |
| /* Print the string to tmp so we can determine the size that |
| * we actually need */ |
| memset(tmp, 0, sizeof(tmp)); |
| va_start(ap, fmt); |
| /* vsnprintf will return the # of bytes not written */ |
| skipped = vsnprintf(tmp, base, fmt, ap); |
| va_end(ap); |
| |
| /* realloc/alloc s1 to be just the size that we need */ |
| needed = strlen(tmp) + 1; |
| *s1 = realloc(*s1, needed); |
| |
| if (NULL == *s1) { |
| /* No string lived here previously, or we failed to |
| * make a copy of it, either way there's nothing we |
| * can do. */ |
| if (NULL == *orig) { |
| cli_errno = CL_ENOMEM; |
| return -1; |
| } |
| /* We can't even allocate enough size to restore the |
| * saved copy, just give up */ |
| *s1 = realloc(*s1, strlen(orig) + 1); |
| if (NULL == *s1) { |
| free(tmp); |
| free(orig); |
| cli_errno = CL_ENOMEM; |
| return -1; |
| } |
| /* Give the string back as we found it */ |
| memset(*s1, 0, sizeof(*s1)); |
| memcpy(*s1, orig, strlen(orig) + 1); |
| free(tmp); |
| free(orig); |
| cli_errno = CL_ENOMEM; |
| return 0; |
| } |
| |
| /* Ok, great, we have enough room */ |
| memset(*s1, 0, sizeof(*s1)); |
| memcpy(*s1, tmp, needed); |
| free(tmp); |
| |
| /* Free tmp only if s1 was reallocated instead of allocated */ |
| if (NULL != orig) |
| free(orig); |
| |
| if (skipped) { |
| /* s1 was bigger than PATH_MAX when expanded, however part |
| * of the string was printed. Tell the caller not to use it */ |
| cli_errno = CL_ETOOBIG; |
| return -1; |
| } |
| |
| /* Success! */ |
| cli_errno = CL_EOK; |
| return (int) needed; |
| } |
| |
| /* Ported from FBSD strtok.c 8.1 (Berkeley) 6/4/93 */ |
| char * cli_strtok_r(char *s, const char *delim, char **last) |
| { |
| 273,10 → 183,7 |
|---|
| if (NULL == usr->cwd) |
| snprintf(usr->cwd, PATH_MAX, "(unknown)"); |
| |
| if (1 < cli_psprintf(&usr->prompt, "%s # ", usr->cwd)) { |
| cli_error(cli_errno, "Failed to set prompt"); |
| return 1; |
| } |
| asprintf(&usr->prompt, "%s # ", usr->cwd); |
| |
| return 0; |
| } |