diff options
| -rw-r--r-- | client/cmd.cpp | 5 | ||||
| -rw-r--r-- | client/parse.cpp | 111 | ||||
| -rw-r--r-- | client/parse.h | 12 | ||||
| -rw-r--r-- | client/readme.md | 7 |
4 files changed, 116 insertions, 19 deletions
diff --git a/client/cmd.cpp b/client/cmd.cpp index 4a2c8a3..1ec2cb8 100644 --- a/client/cmd.cpp +++ b/client/cmd.cpp @@ -48,9 +48,10 @@ void cmd_send(char* addr_str) { char* data; size_t data_size; - if (strtodata(data_str, &data, &data_size)) { + int err = strtodata(data_str, &data, &data_size); + if (err <= 0) { printf("data format error at index %d:\n%s\n%*s^\n", - (int) data_size, data_str, (int) data_size, ""); + -err, data_str, -err, ""); return; } diff --git a/client/parse.cpp b/client/parse.cpp index d15207c..223dc5d 100644 --- a/client/parse.cpp +++ b/client/parse.cpp @@ -1,31 +1,116 @@ +#include <math.h> #include <stdlib.h> #include <string.h> +#include <stdio.h> #include "parse.h" -static unsigned ifsrun(const char* input, const char* ift) { - unsigned i; - for (i = 0; input[i] != '\0' && strchr(ift, input[i]); i++); - return i; +static int parse_str(const char* str, char* data, size_t* size) { + char closing = str[0]; + char escape = false; + bool scan = data == NULL; + int i = 0; + size_t len = strlen(str); + + switch (str[i]) { + case '\'': + escape = false; + break; + case '\"': + escape = true; + break; + default: + return -i; + } + + for (i = 1; i < len && str[i] != '\0'; i++) { + char c = str[i]; + + if (c == closing) { + if (scan) printf("string%s of length %d\n", escape ? " (w/ escape)" : "", i - 1); + return i + 1; // +1 for closing quote + } + + if (scan) *size += 1; + } + + return -i; +} + +static int parse_num(const char* str, char* data, size_t* size) { + const char* ifs = IFS; + size_t len = strcspn(str, ifs); + bool scan = data == NULL; + int i = 0; + int base = 10; + bool bytestring = false; + + const char* colon = strchr(str, ':'); + if (colon != NULL && colon < str + len) { // byte string + base = 16; + bytestring = true; + } else if (len > 2 && strncmp(str, "0x", 2) == 0) { // hexadecimal prefix + base = 16; + i += 2; + }/* else if (len > 1 && strncmp(str, "0", 1) == 0) { // octal prefix + base = 8; + i += 1; + }*/ + + const char* set; + // if (base == 8) set = SET_OCT; + if (base == 10) set = SET_DEC; + if (base == 16) { + if (bytestring) set = SET_HEX_STR; + else set = SET_HEX; + } + + size_t len_ok = strspn(str + i, set) + i; + if (len != len_ok) return -len_ok; + + if (scan) { + if (base == 10) *size += 1; + else if (base == 16) { + if (!bytestring) { + *size += (len - i + 1) / 2; + } else { + for (; colon != NULL && colon < str + len; colon = strchr(str, ':')) { + *size += 1; + } + } + } + } + + if (scan) printf("number (base %d%s) of length %lu\n", base, bytestring ? " as bytestring" : "", len - i); + return len; } int strtodata(const char* str, char** data, size_t* size) { const char* ifs = IFS; *size = 0; size_t i; - size_t str_len = strlen(str); + size_t len = strlen(str); - // TODO: finish this parser - // for (i = 0; i < str_len; i++) { - // unsigned ifs_run = ifsrun(&str[i], ifs); - // - // } + for (i = 0; i < len;) { + // skip whitespace + int run; + run = strspn(&str[i], ifs); + if (run > 0) printf("skipping whitespace for %d bytes...\n", run); + i += run; + // end of string + if (str[i] == '\0') break; - *size = str_len; + if ((run = parse_str(str + i, NULL, size)) > 0) { i += run; continue; } + if ((run = parse_num(str + i, NULL, size)) > 0) { i += run; continue; } - *data = (char*) malloc(*size); + // no format detected + return -i + run; + } + printf("end of string w/o parse errors\n"); + printf("buffer size is now %lu\n", *size); + exit(0); - memcpy(*data, str, *size); + *data = (char*) malloc(*size); return 0; } diff --git a/client/parse.h b/client/parse.h index ac06446..10274e7 100644 --- a/client/parse.h +++ b/client/parse.h @@ -4,6 +4,11 @@ #define IFS " \t\n" +#define SET_OCT "01234567" +#define SET_DEC "0123456789" +#define SET_HEX SET_DEC"abcdefABCDEF" +#define SET_HEX_STR SET_HEX":" + /** * \brief modify \p token to point to the first token when broken up on \p ifs * and return the remaining data @@ -26,13 +31,12 @@ char* consume_token(char* token, const char* ifs); * \param data pointer to \c char* that will store the resulting data * \param size size of \p data * - * \return 0 if the string was parsed succesfully, or 1 if the string could not - * be parsed succesfully + * \return 0 or a negative integer representing the index where there is a + * syntax error if there was an error, or a positive integer representing the + * amount of bytes parsed from \p str * * \note The pointer that \p data refers to will not be initialized by this * function if parsing fails - * \note \p size will contain the index of \p str where the first invalid data - * was found if parsing fails */ int strtodata(const char* str, char** data, size_t* size); diff --git a/client/readme.md b/client/readme.md index 9d755aa..04471d2 100644 --- a/client/readme.md +++ b/client/readme.md @@ -12,3 +12,10 @@ goal (in order of implementation): ls list connected puzzle modules ``` + +``` +send 0x39 "Hello world!" de:ad:be:ef 0xff 5 0a 0750 + ^~~~~~~~~~~~~~ ^~~~~~~~~~~ ~^~~ ~^ ~^ ~~~~^ + STR_INTP BYTE_ARR UNSIGNED UNSIGNED UNSIGNED UNSIGNED + (hex+0x) (dec) (hex) (oct) +``` |