diff options
Diffstat (limited to 'src/utils.c')
| -rw-r--r-- | src/utils.c | 222 |
1 files changed, 113 insertions, 109 deletions
diff --git a/src/utils.c b/src/utils.c index 56cca93..16f7589 100644 --- a/src/utils.c +++ b/src/utils.c @@ -9,127 +9,131 @@ * misc: the returned pointer must be freed by the caller using free() * limits: processes at most 10 words, each up to 49 characters (last '\0') */ -char *string_format(char* string) { - // Wörterbuch array [Wort][Zeichenkette] - char woerter[10][50] = { 0 }; - int wort_index = 0; - int char_index = 0; - - while (*string != '\0') { - // add '\0' stringterminator to end of word - if (*string == ' ' && char_index > 0) { - // safty check for array length - if (wort_index > 9 || char_index > 49) { - break; - } - - // next slot is char - // add '\0' to end string - woerter[wort_index][char_index] = '\0'; - wort_index++; - char_index = 0; - string++; - continue; - } - // skip extra spaces - else if (*string == ' ' && char_index == 0) { - string++; - continue; - } - - // safty check for array length - if (char_index >= 49) { - break; - } - - woerter[wort_index][char_index] = *string; - char_index++; - string++; - } - - // terminate last word with '\0' - if (char_index > 0 && wort_index < 10 && char_index < 49) { - woerter[wort_index][char_index] = '\0'; - wort_index++; - } - - /* - * return - */ - char *ptr = NULL; - - // get length of woerter array - if (wort_index == 0) { - ptr = NULL; - } else { - int sum = 0; - - for (int i = 0; i < wort_index; i++) { - sum += strlen(woerter[i]); - } - sum += wort_index - 1; // for spaces - sum += 1; // for Nulltermination - - - ptr = (char *)malloc(sum); - - // check for NULL pointer - if (ptr == NULL) { - return NULL; - } - - //strcpy - char *ende = ptr; - - for (int i = 0; i < wort_index; i++) { - ende = stpcpy(ende, woerter[i]); - - if (i != wort_index - 1) { - *(ende++) = ' '; - } - } - } - - return ptr; +char *string_format(char* string) +{ + // Wörterbuch array [Wort][Zeichenkette] + char woerter[10][50] = { 0 }; + int wort_index = 0; + int char_index = 0; + + while (*string != '\0') { + // add '\0' stringterminator to end of word + if (*string == ' ' && char_index > 0) { + // safty check for array length + if (wort_index > 9 || char_index > 49) { + break; + } + + // next slot is char + // add '\0' to end string + woerter[wort_index][char_index] = '\0'; + wort_index++; + char_index = 0; + string++; + continue; + } + // skip extra spaces + else if (*string == ' ' && char_index == 0) { + string++; + continue; + } + + // safty check for array length + if (char_index >= 49) { + break; + } + + woerter[wort_index][char_index] = *string; + char_index++; + string++; + } + + // terminate last word with '\0' + if (char_index > 0 && wort_index < 10 && char_index < 49) { + woerter[wort_index][char_index] = '\0'; + wort_index++; + } + + /* + * return + */ + char *ptr = NULL; + + // get length of woerter array + if (wort_index == 0) { + ptr = NULL; + } else { + int sum = 0; + + for (int i = 0; i < wort_index; i++) { + sum += strlen(woerter[i]); + } + sum += wort_index - 1; // for spaces + sum += 1; // for Nulltermination + + + ptr = (char *)malloc(sum); + + // check for NULL pointer + if (ptr == NULL) { + return NULL; + } + + //strcpy + char *ende = ptr; + + for (int i = 0; i < wort_index; i++) { + ende = stpcpy(ende, woerter[i]); + + if (i != wort_index - 1) { + *(ende++) = ' '; + } + } + } + + return ptr; } // input two char pointer // output: one char pointer // misc: caller needs to free the memory -char *concat(const char *s1, const char *s2) { - const size_t len1 = strlen(s1); - const size_t len2 = strlen(s2); - char *result = malloc(len1 + len2 + 1); // +1 for '\0' - - if (result == NULL) { - perror("allocating memory for strings failed"); - return NULL; - } - - memcpy(result, s1, len1); - memcpy(result + len1, s2, len2 + 1); // +1 for null-terminator - return result; //caller needs to free memory +char *concat(const char *s1, const char *s2) +{ + const size_t len1 = strlen(s1); + const size_t len2 = strlen(s2); + char *result = malloc(len1 + len2 + 1); // +1 for '\0' + + if (result == NULL) { + perror("allocating memory for strings failed"); + return NULL; + } + + memcpy(result, s1, len1); + memcpy(result + len1, s2, len2 + 1); // +1 for null-terminator + return result; //caller needs to free memory } +// input: pointer to string +// output: pointer to string with leading and tailing whitespaces removed char *trim_whitespace(char* str) { - char *end; + char *end; + + // Trim leading spaces + while (*str == ' ' || *str == '\t' || *str == '\n' || *str == '\r') { + str++; + } + + if (*str == '\0') return str; // all spaces - // Trim leading spaces - while (*str == ' ' || *str == '\t' || *str == '\n' || *str == '\r') { - str++; - } + // Trim trailing space + end = str + strlen(str) - 1; - if (*str == '\0') return str; // all spaces - - // Trim trailing space - end = str + strlen(str) - 1; + while (end > str && (*end == ' ' || *end == '\t' || *end == '\r' || *end == '\n')) end--; - while (end > str && (*end == ' ' || *end == '\t' || *end == '\r' || *end == '\n')) end--; - - // Write new null terminator character - end[1] = '\0'; + // Write new null terminator character + end[1] = '\0'; - return str; + return str; } |