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85 lines
1.7 KiB
85 lines
1.7 KiB
#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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char *getLine(void);
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char *trim(char *phrase);
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char *getLine(void) {
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const size_t sizeIncrement = 10;
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char *buffer = malloc(sizeIncrement);
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char *currentPosition = buffer;
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size_t maximumLength = sizeIncrement;
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size_t length = 0;
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int character;
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if (currentPosition == NULL) {
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return NULL;
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}
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while (1) {
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character =fgetc(stdin);
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if (character == '\n') {
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break;
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}
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if (++length >= maximumLength) {
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char *newBuffer = (char*) realloc(buffer, maximumLength += sizeIncrement);
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if (newBuffer == NULL) {
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free(buffer);
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return NULL;
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}
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currentPosition = newBuffer + (currentPosition - buffer);
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buffer = newBuffer;
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}
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*currentPosition++ = character;
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}
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*currentPosition = '\0';
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return buffer;
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}
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char *trim(char *phrase) {
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char *old = phrase;
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char *new = phrase;
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// skip blank chars
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while (*old == ' ') {
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old++;
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}
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while (*old) {
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*new = *old;
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new++;
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old++;
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}
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// set string end char
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*new = 0;
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return (char*) realloc(phrase, strlen(phrase) + 1);
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}
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int main(void) {
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// this is wrong -> realloc in trim() on array which wasn't malloc'ed
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// char blub[] = " wurstgesicht";
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// printf("%s\n", trim(blub));
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// by using return value of getline(), we got an array which was malloc'ed
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char *buffer = trim(getLine());
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if (buffer == NULL) {
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printf("%s\n", "out of memory");
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} else {
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printf("%s\n", buffer);
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free(buffer);
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}
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return 0;
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}
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