8b58e81077
better parsing of sh commands (copied from jos sh) cat: read from 1 if no args sbrk system call, but untested getpid system call moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?
90 lines
1.1 KiB
C
90 lines
1.1 KiB
C
#include "types.h"
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#include "stat.h"
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#include "fcntl.h"
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#include "user.h"
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int
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puts(char *s)
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{
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return write(1, s, strlen(s));
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}
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char*
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strcpy(char *s, char *t)
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{
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char *os;
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os = s;
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while((*s++ = *t++) != 0)
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;
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return os;
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}
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int
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strcmp(const char *p, const char *q)
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{
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while (*p && *p == *q)
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p++, q++;
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return (int) ((unsigned char) *p - (unsigned char) *q);
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}
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unsigned int
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strlen(char *s)
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{
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int n = 0;
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for(n = 0; s[n]; n++)
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;
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return n;
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}
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void *
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memset(void *dst, int c, unsigned int n)
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{
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char *d = (char *) dst;
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while(n-- > 0)
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*d++ = c;
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return dst;
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}
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char *
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strchr(const char *s, char c)
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{
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for (; *s; s++)
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if (*s == c)
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return (char *) s;
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return 0;
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}
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char *
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gets(char *buf, int max)
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{
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int i = 0, cc;
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char c;
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while(i+1 < max){
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cc = read(0, &c, 1);
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if(cc < 1)
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break;
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if(c == '\n' || c == '\r')
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break;
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buf[i++] = c;
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}
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buf[i] = '\0';
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return buf;
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}
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int
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stat(char *n, struct stat *st)
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{
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int fd;
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int r;
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fd = open(n, O_RDONLY);
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if (fd < 0) return -1;
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r = fstat(fd, st);
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close(fd);
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return r;
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}
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