ref: d577b80805af59c6681348bf01871663df29d9c7
dir: /buf.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <mouse.h> #include <keyboard.h> #include "a.h" int readfile(Buffer *buf, char *filename) { int fd; long r; buf->count = 0; buf->size = 8192; buf->data = malloc(buf->size); if(buf->data == nil) return -1; fd = open(filename, OREAD); if(fd < 0) return -1; for(;;){ r = read(fd, buf->data + buf->count, buf->size - buf->count); if(r < 0) return -1; if(r == 0) break; buf->count += r; if(buf->count == buf->size){ buf->size *= 1.5; buf->data = realloc(buf->data, buf->size); if(buf->data == nil) return -1; } } buf->data[buf->count] = 0; close(fd); return 0; } int writefile(Buffer *buf, char *filename) { int fd, n; fd = open(filename, OWRITE|OTRUNC); if(fd < 0) return -1; n = write(fd, buf->data, buf->count); if(n < 0 || n != buf->count) return -1; close(fd); return 0; } int delete(Buffer *buf, int index) { if(index != buf->count - 1) memmove(&buf->data[index], &buf->data[index + 1], buf->count - index); buf->count -= 1; /* TODO: is that really what we want ? */ if(buf->count == 0){ buf->count = 1; buf->data[0] = 0; } return 0; } int insert(Buffer *buf, int index) { if(buf->count == buf->size){ buf->size *= 1.5; buf->data = realloc(buf->data, buf->size); if(buf->data == nil) return -1; } buf->count += 1; memmove(&buf->data[index + 1], &buf->data[index], buf->count - index); buf->data[index] = 0; buf->data[buf->count] = 0; return 1; } int append(Buffer *buf, int index) { return insert(buf, index + 1); }