This allows you to read ini-formatted data from anywhere and then import one of the sections into the environment
This is based on rev 16 at http://code.google.com/p/inih/
Signed-off-by: Joe Hershberger joe.hershberger@ni.com --- Changes in v2: - Documented in README - Made all functions static - Changed if statments to ternary operator selected parameters - Return any errors from ini_parse() to the shell
README | 1 + common/Makefile | 1 + common/cmd_ini.c | 247 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 249 insertions(+) create mode 100644 common/cmd_ini.c
diff --git a/README b/README index af76b0c..dfa4f6b 100644 --- a/README +++ b/README @@ -814,6 +814,7 @@ The following options need to be configured: CONFIG_CMD_IMLS List all found images CONFIG_CMD_IMMAP * IMMR dump support CONFIG_CMD_IMPORTENV * import an environment + CONFIG_CMD_INI * import data from an ini file into the env CONFIG_CMD_IRQ * irqinfo CONFIG_CMD_ITEST Integer/string test of 2 values CONFIG_CMD_JFFS2 * JFFS2 Support diff --git a/common/Makefile b/common/Makefile index 125b2be..92e06de 100644 --- a/common/Makefile +++ b/common/Makefile @@ -107,6 +107,7 @@ COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o COBJS-$(CONFIG_CMD_IDE) += cmd_ide.o COBJS-$(CONFIG_CMD_IMMAP) += cmd_immap.o +COBJS-$(CONFIG_CMD_INI) += cmd_ini.o COBJS-$(CONFIG_CMD_IRQ) += cmd_irq.o COBJS-$(CONFIG_CMD_ITEST) += cmd_itest.o COBJS-$(CONFIG_CMD_JFFS2) += cmd_jffs2.o diff --git a/common/cmd_ini.c b/common/cmd_ini.c new file mode 100644 index 0000000..652e4f6 --- /dev/null +++ b/common/cmd_ini.c @@ -0,0 +1,247 @@ +/* + * inih -- simple .INI file parser + * + * inih is released under the New BSD license (see LICENSE.txt). Go to the + * project home page for more info: + * + * http://code.google.com/p/inih/ + */ + +#include <common.h> +#include <command.h> +#include <environment.h> +#include <linux/ctype.h> +#include <linux/string.h> + +#ifdef CONFIG_INI_MAX_LINE +#define MAX_LINE CONFIG_INI_MAX_LINE +#else +#define MAX_LINE 200 +#endif + +#ifdef CONFIG_INI_MAX_SECTION +#define MAX_SECTION CONFIG_INI_MAX_SECTION +#else +#define MAX_SECTION 50 +#endif + +#ifdef CONFIG_INI_MAX_NAME +#define MAX_NAME CONFIG_INI_MAX_NAME +#else +#define MAX_NAME 50 +#endif + +/* Strip whitespace chars off end of given string, in place. Return s. */ +static char *rstrip(char *s) +{ + char *p = s + strlen(s); + + while (p > s && isspace(*--p)) + *p = '\0'; + return s; +} + +/* Return pointer to first non-whitespace char in given string. */ +static char *lskip(const char *s) +{ + while (*s && isspace(*s)) + s++; + return (char *)s; +} + +/* Return pointer to first char c or ';' comment in given string, or pointer to + null at end of string if neither found. ';' must be prefixed by a whitespace + character to register as a comment. */ +static char *find_char_or_comment(const char *s, char c) +{ + int was_whitespace = 0; + + while (*s && *s != c && !(was_whitespace && *s == ';')) { + was_whitespace = isspace(*s); + s++; + } + return (char *)s; +} + +/* Version of strncpy that ensures dest (size bytes) is null-terminated. */ +static char *strncpy0(char *dest, const char *src, size_t size) +{ + strncpy(dest, src, size); + dest[size - 1] = '\0'; + return dest; +} + +/* Emulate the behavior of fgets but on memory */ +static char *memgets(char *str, int num, char **mem, size_t *memsize) +{ + char *end; + int len; + int newline = 1; + + end = memchr(*mem, '\n', *memsize); + if (end == NULL) { + if (*memsize == 0) + return NULL; + end = *mem + *memsize; + newline = 0; + } + len = min((end - *mem) + newline, num); + memcpy(str, *mem, len); + if (len < num) + str[len] = '\0'; + + /* prepare the mem vars for the next call */ + *memsize -= (end - *mem) + newline; + *mem += (end - *mem) + newline; + + return str; +} + +/* Parse given INI-style file. May have [section]s, name=value pairs + (whitespace stripped), and comments starting with ';' (semicolon). Section + is "" if name=value pair parsed before any section heading. name:value + pairs are also supported as a concession to Python's ConfigParser. + + For each name=value pair parsed, call handler function with given user + pointer as well as section, name, and value (data only valid for duration + of handler call). Handler should return nonzero on success, zero on error. + + Returns 0 on success, line number of first error on parse error (doesn't + stop on first error). +*/ +static int ini_parse(char *filestart, size_t filelen, + int (*handler)(void *, char *, char *, char *), void *user) +{ + /* Uses a fair bit of stack (use heap instead if you need to) */ + char line[MAX_LINE]; + char section[MAX_SECTION] = ""; + char prev_name[MAX_NAME] = ""; + + char *curmem = filestart; + char *start; + char *end; + char *name; + char *value; + size_t memleft = filelen; + int lineno = 0; + int error = 0; + + /* Scan through file line by line */ + while (memgets(line, sizeof(line), &curmem, &memleft) != NULL) { + lineno++; + start = lskip(rstrip(line)); + + if (*start == ';' || *start == '#') { + /* + * Per Python ConfigParser, allow '#' comments at start + * of line + */ + } +#if CONFIG_INI_ALLOW_MULTILINE + else if (*prev_name && *start && start > line) { + /* + * Non-blank line with leading whitespace, treat as + * continuation of previous name's value (as per Python + * ConfigParser). + */ + if (!handler(user, section, prev_name, start) && !error) + error = lineno; + } +#endif + else if (*start == '[') { + /* A "[section]" line */ + end = find_char_or_comment(start + 1, ']'); + if (*end == ']') { + *end = '\0'; + strncpy0(section, start + 1, sizeof(section)); + *prev_name = '\0'; + } else if (!error) { + /* No ']' found on section line */ + error = lineno; + } + } else if (*start && *start != ';') { + /* Not a comment, must be a name[=:]value pair */ + end = find_char_or_comment(start, '='); + if (*end != '=') + end = find_char_or_comment(start, ':'); + if (*end == '=' || *end == ':') { + *end = '\0'; + name = rstrip(start); + value = lskip(end + 1); + end = find_char_or_comment(value, '\0'); + if (*end == ';') + *end = '\0'; + rstrip(value); + /* Strip double-quotes */ + if (value[0] == '"' && + value[strlen(value)-1] == '"') { + value[strlen(value)-1] = '\0'; + value += 1; + } + + /* + * Valid name[=:]value pair found, call handler + */ + strncpy0(prev_name, name, sizeof(prev_name)); + if (!handler(user, section, name, value) && + !error) + error = lineno; + } else if (!error) + /* No '=' or ':' found on name[=:]value line */ + error = lineno; + } + } + + return error; +} + +static int ini_handler(void *user, char *section, char *name, char *value) +{ + char *requested_section = (char *)user; +#ifdef CONFIG_INI_CASE_INSENSITIVE + int i; + + for (i = 0; i < strlen(requested_section); i++) + requested_section[i] = tolower(requested_section[i]); + for (i = 0; i < strlen(section); i++) + section[i] = tolower(section[i]); +#endif + + if (!strcmp(section, requested_section)) { +#ifdef CONFIG_INI_CASE_INSENSITIVE + for (i = 0; i < strlen(name); i++) + name[i] = tolower(name[i]); + for (i = 0; i < strlen(value); i++) + value[i] = tolower(value[i]); +#endif + setenv(name, value); + printf("ini: Imported %s as %s\n", name, value); + } + + /* success */ + return 1; +} + +static int do_ini(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + const char *section; + char *file_address; + size_t file_size; + + if (argc == 1) + return CMD_RET_USAGE; + + section = argv[1]; + file_address = (char *)simple_strtoul( + argc < 3 ? getenv("loadaddr") : argv[2], NULL, 16); + file_size = (size_t)simple_strtoul( + argc < 4 ? getenv("filesize") : argv[3], NULL, 16); + + return ini_parse(file_address, file_size, ini_handler, (void *)section); +} + +U_BOOT_CMD( + ini, 4, 0, do_ini, + "parse an ini file in memory and merge the specified section into the env", + "section [[file-address] file-size]" +);