diff options
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/Config.in | 7 | ||||
| -rw-r--r-- | util-linux/mdev.c | 44 |
2 files changed, 48 insertions, 3 deletions
diff --git a/util-linux/Config.in b/util-linux/Config.in index 1f4322bec..869ec61d5 100644 --- a/util-linux/Config.in +++ b/util-linux/Config.in @@ -321,6 +321,13 @@ config FEATURE_MDEV_RENAME For more information, please see docs/mdev.txt +config FEATURE_MDEV_RENAME_REGEXP + bool "Support regular expressions substitutions when renaming device" + default n + depends on FEATURE_MDEV_RENAME + help + Add support for regular expressions substitutions when renaming device. + config FEATURE_MDEV_EXEC bool "Support command execution at device addition/removal" default n diff --git a/util-linux/mdev.c b/util-linux/mdev.c index c8d603bcf..9d77f6a1f 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -84,6 +84,8 @@ static void make_device(char *path, int delete) goto end_parse; while ((line = xmalloc_fgetline(fp)) != NULL) { + regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP]; + ++lineno; trim(line); if (!line[0]) @@ -95,16 +97,24 @@ static void make_device(char *path, int delete) next = next_field(line); { regex_t match; - regmatch_t off; int result; /* Is this it? */ xregcomp(&match, line, REG_EXTENDED); - result = regexec(&match, device_name, 1, &off, 0); + result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0); regfree(&match); + //bb_error_msg("matches:"); + //for (int i = 0; i < ARRAY_SIZE(off); i++) { + // if (off[i].rm_so < 0) continue; + // bb_error_msg("match %d: '%.*s'\n", i, + // (int)(off[i].rm_eo - off[i].rm_so), + // device_name + off[i].rm_so); + //} + /* If not this device, skip rest of line */ - if (result || off.rm_so || off.rm_eo != strlen(device_name)) + /* (regexec returns whole pattern as "range" 0) */ + if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name)) goto next_line; } @@ -152,7 +162,35 @@ static void make_device(char *path, int delete) val = next; next = next_field(val); if (*val == '>') { +#if ENABLE_FEATURE_MDEV_RENAME_REGEXP + /* substitute %1..9 with off[1..9], if any */ + char *s, *p; + unsigned i, n; + + n = 0; + s = val; + while (*s && *s++ == '%') + n++; + + p = alias = xzalloc(strlen(val) + n * strlen(device_name)); + s = val + 1; + while (*s) { + *p = *s; + if ('%' == *s) { + i = (s[1] - '0'); + if (i <= 9 && off[i].rm_so >= 0) { + n = off[i].rm_eo - off[i].rm_so; + strncpy(p, device_name + off[i].rm_so, n); + p += n - 1; + s++; + } + } + p++; + s++; + } +#else alias = xstrdup(val + 1); +#endif } } |