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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char *read_paragraph(int (*read)(void *), void *stream) {
int buffer_size = 0, length = 0;
char *buffer = NULL;
int ch;
while ((ch = (*read)(stream)) != EOF) {
if (++length > buffer_size) {
buffer_size += 100;
buffer = realloc(buffer, buffer_size + 1);
}
if ((buffer[length - 1] = ch) == '\n') {
buffer[--length] = '\0';
break;
}
buffer[length] = '\0';
}
return buffer;
}
void by_paragraph(int (*read)(void *), void *in, void (*write)(void *, char *), void *out) {
while (1) {
char *line = read_paragraph(read, in);
if ((line == NULL) || (strlen(line) == 0)) {
return;
}
(*write)(out, line);
free(line);
}
}
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