various code that may end up as a mail client

pull/1/merge
Christian Neukirchen 8 years ago
commit 30f0686fb2

@ -0,0 +1,373 @@
// memmem
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <time.h>
// WSP = SP / HTAB
#define iswsp(c) (((c) == ' ' || (c) == '\t'))
#define bufsiz 4096
static long
parse_posint(char **s, size_t minn, size_t maxn)
{
long n;
char *end;
errno = 0;
n = strtol(*s, &end, 10);
if (errno) {
// perror("strtol");
return -1;
}
if (n < (long)minn || n > (long)maxn) {
// fprintf(stderr, "number outside %zd <= n < %zd\n", minn, maxn);
return -1;
}
*s = end;
return n;
}
time_t
parse_date(char *s) {
struct tm tm;
int c;
#if 0
#define i4(m) (s[0] && (s[0]|0x20) == m[0] && \
s[1] && (s[1]|0x20) == m[1] && \
s[2] && (s[2]|0x20) == m[2] && \
s[3] && (s[3]|0x20) == m[3] && (s = s+4) )
#define i3(m) (s[0] && (s[0]|0x20) == m[0] && \
s[1] && (s[1]|0x20) == m[1] && \
s[2] && (s[2]|0x20) == m[2] && (s = s+3) )
#endif
#define i4(m) (((uint32_t) m[0]<<24 | m[1]<<16 | m[2]<<8 | m[3]) == \
((uint32_t) s[0]<<24 | s[1]<<16 | s[2]<<8 | s[3] | 0x20202020) \
&& (s += 4))
#define i3(m) (((uint32_t) m[0]<<24 | m[1]<<16 | m[2]<<8) == \
((uint32_t) s[0]<<24 | s[1]<<16 | s[2]<<8 | 0x20202000) \
&& (s += 3))
while (iswsp(*s))
s++;
if (i4("mon,") || i4("tue,") || i4("wed,") || i4("thu,") ||
i4("fri,") || i4("sat,") || i4("sun,"))
while (iswsp(*s))
s++;
if ((c = parse_posint(&s, 1, 31)) < 0) goto fail;
tm.tm_mday = c;
while (iswsp(*s))
s++;
if (i3("jan")) tm.tm_mon = 0;
else if (i3("feb")) tm.tm_mon = 1;
else if (i3("mar")) tm.tm_mon = 2;
else if (i3("apr")) tm.tm_mon = 3;
else if (i3("may")) tm.tm_mon = 4;
else if (i3("jul")) tm.tm_mon = 5;
else if (i3("jun")) tm.tm_mon = 6;
else if (i3("aug")) tm.tm_mon = 7;
else if (i3("sep")) tm.tm_mon = 8;
else if (i3("oct")) tm.tm_mon = 9;
else if (i3("nov")) tm.tm_mon = 10;
else if (i3("dec")) tm.tm_mon = 11;
else goto fail;
while (iswsp(*s))
s++;
if ((c = parse_posint(&s, 1000, 9999)) > 0) {
tm.tm_year = c - 1900;
} else if ((c = parse_posint(&s, 0, 49)) > 0) {
tm.tm_year = c + 100;
} else if ((c = parse_posint(&s, 50, 99)) > 0) {
tm.tm_year = c;
} else goto fail;
while (iswsp(*s))
s++;
if ((c = parse_posint(&s, 0, 24)) < 0) goto fail;
tm.tm_hour = c;
if (*s++ != ':') goto fail;
if ((c = parse_posint(&s, 0, 59)) < 0) goto fail;
tm.tm_min = c;
if (*s++ == ':') {
if ((c = parse_posint(&s, 0, 61)) < 0) goto fail;
tm.tm_sec = c;
}
while (iswsp(*s))
s++;
if (*s == '+' || *s == '-') {
int neg = (*s == '-');
s++;
if ((c = parse_posint(&s, 0, 10000)) < 0) goto fail;
if (neg) {
tm.tm_hour += c / 100;
tm.tm_min += c % 100;
} else {
tm.tm_hour -= c / 100;
tm.tm_min -= c % 100;
}
}
tm.tm_isdst = -1;
time_t r = mktime(&tm);
return r;
fail:
return -1;
}
char *
parse_addr(char *s, char **dispo, char **addro)
{
static char disp[1024];
static char addr[1024];
// char *disp = disp+sizeof disp;
// char *addr = addr+sizeof addr;
char *c, *e;
printf("RAW : |%s|\n", s);
while (iswsp(*s))
s++;
c = disp;
e = disp + sizeof disp;
*disp = 0;
*addr = 0;
while (*s) {
if (*s == '<') {
char *c = addr;
char *e = addr + sizeof addr;
s++;
while (*s && c < e && *s != '>')
*c++ = *s++;
if (*s == '>')
s++;
*c = 0;
} else if (*s == '"') {
s++;
while (*s && c < e && *s != '"')
*c++ = *s++;
if (*s == '"')
s++;
} else if (*s == '(') {
s++;
if (!*addr) { // assume: user@host (name)
*c-- = 0;
while (c > disp && iswsp(*c))
*c-- = 0;
strcpy(addr, disp);
c = disp;
*c = 0;
}
while (*s && c < e && *s != ')')
*c++ = *s++;
if (*s == ')')
s++;
} else if (*s == ',') {
s++;
break;
} else {
*c++ = *s++;
}
}
*c-- = 0;
// strip trailing ws
while (c > disp && iswsp(*c))
*c-- = 0;
if (*disp && !*addr && strchr(disp, '@')) {
// just mail address was given
strcpy(addr, disp);
*disp = 0;
}
printf("DISP :: |%s|\n", disp);
printf("ADDR :: |%s|\n", addr);
if (dispo) *dispo = disp;
if (addro) *addro = addr;
return s;
}
void
blaze822(char *file)
{
int fd;
ssize_t rd;
char *buf;
ssize_t bufalloc;
ssize_t used;
char *end;
fd = open(file, O_RDONLY);
if (fd < 0) {
perror("open");
return;
}
buf = malloc(3);
buf[0] = '\n';
buf[1] = '\n';
buf[2] = '\n';
bufalloc = 3;
used = 3;
while (1) {
bufalloc += bufsiz;
buf = realloc(buf, bufalloc);
rd = read(fd, buf+used, bufalloc-used);
if (rd == 0) {
end = buf+used;
break;
}
if (rd < 0)
exit(-1);
if ((end = memmem(buf-1+used, rd+1, "\n\n", 2)) ||
(end = memmem(buf-3+used, rd+3, "\r\n\r\n", 4))) {
used += rd;
break;
}
used += rd;
}
close(fd);
end++;
*end = 0; // dereferencing *end is safe
char *s;
for (s = buf; s < end; s++) {
if (*s == 0) // sanitize nul bytes in headers
*s = ' ';
if (*s == '\r') {
if (*(s+1) == '\n') {
*s++ = '\n';
} else {
*s = ' ';
}
}
if (iswsp(*s)) {
// change prior \n to spaces
int j;
for (j = 1; s - j >= buf && *(s-j) == '\n'; j++)
*(s-j) = ' ';
}
if (*s == '\n') {
s++;
if (iswsp(*s)) {
*(s-1) = ' ';
} else {
*(s-1) = 0;
if (*(s-2) == '\n') // ex-crlf
*(s-2) = 0;
while (s < end && *s != ':') {
*s = tolower(*s);
s++;
}
}
}
}
buf[0] = 0;
/*
for (s = buf; s < end; ) {
printf("%s\n", s);
s += strlen(s) + 1;
}
*/
char *v;
if ((v = memmem(buf, end-buf, "\0from:", 6))) {
printf("FROM : %s\n", v+6);
parse_addr(v+6, 0, 0);
}
if ((v = memmem(buf, end-buf, "\0to:", 4))) {
printf("TO : %s\n", v+4);
char *a = v+4;
char *disp, *addr;
do {
a = parse_addr(a, &disp, &addr);
printf("DISP: |%s| ADDR: |%s|\n", disp, addr);
} while (*a);
}
if ((v = memmem(buf, end-buf, "\0date:", 6))) {
printf("DATE : %s\n", v+6);
time_t t = parse_date(v+6);
if (t != -1)
printf("DATE :: %s", ctime(&t));
else
fprintf(stderr, "invalid date: %s\n", v+6);
}
if ((v = memmem(buf, end-buf, "\0subject:", 9))) {
printf("SUBJECT : %s\n", v+9);
}
free(buf);
printf("used: %d %d\n", used, end-buf);
}
int
main(int argc, char *argv[]) {
char *s;
char *line = 0;
size_t linelen = 0;
int read;
int i = 0;
if (argc == 1 || (argc == 2 && strcmp(argv[1], "-") == 0)) {
while ((read = getdelim(&line, &linelen, '\n', stdin)) != -1) {
if (line[read-1] == '\n') line[read-1] = 0;
fprintf(stderr, "%s\n", line);
blaze822(line);
i++;
}
} else {
for (i = 1; i < argc; i++) {
fprintf(stderr, "%s\n", argv[i]);
blaze822(argv[i]);
}
i--;
}
printf("%d mails scanned\n", i);
return 0;
}

@ -0,0 +1,97 @@
#define _GNU_SOURCE
#include <dirent.h> /* Defines DT_* constants */
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
struct linux_dirent64 {
ino64_t d_ino; /* 64-bit inode number */
off64_t d_off; /* 64-bit offset to next structure */
unsigned short d_reclen; /* Size of this dirent */
unsigned char d_type; /* File type */
char d_name[]; /* Filename (null-terminated) */
};
#define BUF_SIZE 1024000
void flagsort(char *s) {
int i, j;
if (!s[0])
return;
// adapted insertion sort from http://stackoverflow.com/a/2789530
for (i = 1; s[i]; i++) {
char t = s[i];
for (j = i; j >= 1 && t < s[j-1]; j--)
s[j] = s[j-1];
s[j] = t;
}
}
int
main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct linux_dirent64 *d;
int bpos;
char d_type;
fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
if (fd == -1)
handle_error("open");
while (1) {
nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
if (nread == -1)
handle_error("getdents64");
if (nread == 0)
break;
printf("--------------- nread=%d ---------------\n", nread);
printf("inode# file type d_reclen d_off d_name\n");
for (bpos = 0; bpos < nread;) {
d = (struct linux_dirent64 *) (buf + bpos);
if (d->d_type != DT_REG)
goto next;
if (d->d_name[0] == '.')
goto next;
char *flags = strstr(d->d_name, ":2,");
if (!flags)
goto next;
// if (strncmp(d->d_name, "1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1", strlen("1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1")-1))
// goto next;
// printf("%s\n", d->d_name);
flagsort(flags+3);
printf("%s\n", d->d_name);
// if (!strchr(flags, 'S'))
// printf("%s\n", d->d_name);
// goto next;
/*
printf("%-10s ", (d_type == DT_REG) ? "regular" :
(d_type == DT_DIR) ? "directory" :
(d_type == DT_FIFO) ? "FIFO" :
(d_type == DT_SOCK) ? "socket" :
(d_type == DT_LNK) ? "symlink" :
(d_type == DT_BLK) ? "block dev" :
(d_type == DT_CHR) ? "char dev" : "???");
printf("%4d %10lld %s\n", d->d_reclen,
(long long) d->d_off, d->d_name);
*/
next:
bpos += d->d_reclen;
}
}
exit(EXIT_SUCCESS);
}

@ -0,0 +1,48 @@
#include <string.h>
#include <stdio.h>
#include <stdint.h>
int
main(int argc, char *argv[])
{
int i;
unsigned int j;
char *f, *e;
int8_t flagmod[255] = { 0 };
for (i = 1; i < argc; i++) {
if (*argv[i] == '+') {
f = argv[i] + 1;
while (*f)
flagmod[(int)*f++]++;
continue;
} else if (*argv[i] == '-') {
f = argv[i] + 1;
while (*f)
flagmod[(int)*f++]--;
continue;
}
int8_t flags[255] = { 0 };
char flagstr[255];
f = e = strstr(argv[i], ":2,");
if (!f)
continue;
f += 3;
while (*f)
flags[(int)*f++] = 1;
*e = 0;
f = flagstr;
for (j = 0; j < sizeof flags; j++)
if (flags[j] + flagmod[j])
*f++ = j;
*f = 0;
printf("%s:2,%s\n", argv[i], flagstr);
}
return 0;
}

@ -0,0 +1,368 @@
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#undef getc
#define getc getc_unlocked
#ifndef __GLIBC__
#include "/home/chris/src/musl/src/internal/stdio_impl.h"
#endif
FILE *input;
enum {
EOL = -2,
EOH = -3
};
// WSP = SP / HTAB
#define iswsp(c) (((c) == ' ' || (c) == '\t'))
// CRLF is \n, LF is \n, just CR is ' ',
// end of file is EOF, end of line is EOL, end of header is EOH,
// CRLFCR is EOH, CRLFCRLF is EOH, CRCR is EOH
int
mgetch()
{
int c, d;
switch(c = getc(input)) {
case EOF:
return EOF;
case '\r':
d = getc(input);
if (d != '\n') {
// stray CR
ungetc(d, input);
return ' ';
}
/* fallthru */
case '\n':
d = getc(input);
if (d == '\r') {
d = getc(input);
if (d != '\n' && d != '\r')
return d;
}
if (d == '\n' || d == '\r') {
return EOH;
} else if (iswsp(d)) {
// line continuation
return ' ';
} else {
// end of line
ungetc(d, input);
return EOL;
}
default:
return c;
}
}
char *
strip(char *t)
{
char *b, *e;
for (b = t; *b && iswsp(*b); b++);
for (e = b; *e && !iswsp(*e); e++);
*e = 0;
return b;
}
void skipws() {
int c;
do {
c = getc(input);
} while (c != EOF && iswsp(c));
ungetc(c, input);
}
char *
parse_header()
{
static char hdr[1024];
static const char *hdrend = hdr + sizeof hdr;
int c;
char *s = hdr;
*s = 0;
while ((c = mgetch()) > 0 && s < hdrend) {
if (c < 0)
return 0;
if (c == ':') {
*s = 0;
skipws();
return strip(hdr);
}
*s++ = tolower(c);
}
return 0;
}
char *
parse_value()
{
static char value[1024];
static const char *valend = value + sizeof value;
int c;
char *s = value;
*s = 0;
while ((c = mgetch()) != EOF && s < valend) {
if (c == EOH) {
ungetc('\n', input);
return value;
}
if (c == EOL) {
*s = 0;
return value;
}
*s++ = c;
}
return value;
}
int
parse_tok(char **t)
{
static char tok[16];
static const char *tokend = tok + sizeof tok;
int c;
char *s = tok;
*s = 0;
*t = 0;
c = mgetch();
while (iswsp(c))
c = mgetch();
while (c > 0 && s < tokend) {
// printf("%c/%d ", c, c);
if (iswsp(c)) {
skipws();
*s = 0;
*t = tok;
break;
}
else
*s++ = c;
c = mgetch();
}
if (c == EOL) {
*s = 0;
*t = tok;
}
if (t)
*t = strip(tok);
// printf("TOK |%s|", tok);
if (c < 0)
return c;
else {
return 1;
}
}
static long
parse_posint(char *s, size_t minn, size_t maxn)
{
long n;
char *end;
errno = 0;
n = strtol(s, &end, 10);
if (errno || *end || n < (long)minn || n > (long)maxn)
return -1;
return n;
}
int
parse_date(time_t *r)
{
char *t;
int c;
struct tm tm;
if ((c = parse_tok(&t)) < 0) goto fail;
if (strlen(t) == 4 && t[3] == ',') // ignore day of week
if ((c = parse_tok(&t)) < 0) goto fail;
if ((c = parse_posint(t, 1, 31)) < 0) goto fail;
tm.tm_mday = c;
if ((c = parse_tok(&t)) < 0) goto fail;
// convert to switch
if (strcmp("Jan", t) == 0) tm.tm_mon = 0;
else if (strcmp("Feb", t) == 0) tm.tm_mon = 1;
else if (strcmp("Mar", t) == 0) tm.tm_mon = 2;
else if (strcmp("Apr", t) == 0) tm.tm_mon = 3;
else if (strcmp("May", t) == 0) tm.tm_mon = 4;
else if (strcmp("Jun", t) == 0) tm.tm_mon = 5;
else if (strcmp("Jul", t) == 0) tm.tm_mon = 6;
else if (strcmp("Aug", t) == 0) tm.tm_mon = 7;
else if (strcmp("Sep", t) == 0) tm.tm_mon = 8;
else if (strcmp("Oct", t) == 0) tm.tm_mon = 9;
else if (strcmp("Nov", t) == 0) tm.tm_mon = 10;
else if (strcmp("Dec", t) == 0) tm.tm_mon = 11;
else goto fail;
if ((c = parse_tok(&t)) < 0) goto fail;
if ((c = parse_posint(t, 1000, 9999)) > 0) {
tm.tm_year = c - 1900;
} else if ((c = parse_posint(t, 0, 49)) > 0) {
tm.tm_year = c + 100;
} else if ((c = parse_posint(t, 50, 99)) > 0) {
tm.tm_year = c;
} else goto fail;
if ((c = parse_tok(&t)) < 0)
if (!t) goto fail;
if (strlen(t) == 8 && t[2] == ':' && t[5] == ':') {
t[2] = t[5] = 0;
if ((c = parse_posint(t, 0, 24)) < 0) goto fail;
tm.tm_hour = c;
if ((c = parse_posint(t+3, 0, 59)) < 0) goto fail;
tm.tm_min = c;
if ((c = parse_posint(t+6, 0, 61)) < 0) goto fail;
tm.tm_sec = c;
} else if (strlen(t) == 5 && t[2] == ':') {
t[2] = 0;
if ((c = parse_posint(t, 0, 24)) < 0) goto fail;
tm.tm_hour = c;
if ((c = parse_posint(t+3, 0, 59)) < 0) goto fail;
tm.tm_min = c;
tm.tm_sec = 0;
} else {
goto fail;
}
// if ((c = parse_tok(&t)) > 0) goto fail; // expect EOL, EOH, EOF
c = parse_tok(&t);
if (t && strlen(t) == 5 && (t[0] == '+' || t[0] == '-')) {
if ((c = parse_posint(t+1, 0, 10000)) < 0) goto fail;
if (t[0] == '+') {
tm.tm_hour -= c / 100;
tm.tm_min -= c % 100;
} else {
tm.tm_hour += c / 100;
tm.tm_min += c % 100;
}
}
// TODO: parse obs-zone?
tm.tm_isdst = -1;
*r = timegm(&tm);
return 0;
fail:
*r = -1;
/* slurp rest of line and leave it */
while ((c = mgetch()) > 0)
;
return c;
}
int decode_rfc2047 (char *str, char *dst, size_t dstlen);
int catmain() {
int c;
input = stdin;
while ((c = mgetch())) {
if (c > 0)
putchar(c);
else
printf("[%d]\n", c);
}
return 0;
}
int tmain() {
char *s;
input = stdin;
while ((s = parse_header())) {
if (strcmp(s, "date") == 0) {
time_t t;
if (parse_date(&t) >= 0)
printf("%s :: (%ld) %s", s, t, ctime(&t));
else
printf("date : OOPS\n");
} else if (strcmp(s, "subject") == 0) {
char *v = parse_value();
char buf[2048];
decode_rfc2047(v, buf, sizeof buf);
printf("%s : %s\n", s, v);
printf("%s :: %s\n", s, buf);
} else {
char *v = parse_value();
printf("%s : %s\n", s, v);
}
}
return 0;
}
int main() {
char *s;
char *line = 0;
size_t linelen = 0;
int read;
int i = 0;
static char buf[50000]; /* buf must survive until stdout is closed */
while ((read = getdelim(&line, &linelen, '\n', stdin)) != -1) {
if (line[read-1] == '\n') line[read-1] = 0;
printf("%s\n", line);
FILE *f = fopen(line, "r");
if (!f) {
perror("fopen");
continue;
}
setvbuf ( f , buf , _IOFBF , sizeof(buf) );
i++;
input = f;
while ((s = parse_header())) {
if (strcmp(s, "date") == 0) {
time_t t;
if (parse_date(&t) >= 0)
printf("%s :: (%ld) %s", s, t, ctime(&t));
else
printf("date : OOPS\n");
} else if (strcmp(s, "subject") == 0 ||
strcmp(s, "from") == 0 ||
strcmp(s, "to") == 0) {
char *v = parse_value();
char buf[2048];
if (decode_rfc2047(v, buf, sizeof buf))
printf("%s :: %s\n", s, buf);
else
printf("%s : %s\n", s, v);
} else
parse_value(); // and ignore it
}
fclose(f);
}
printf("%d mails scanned\n", i);
return 0;
}

@ -0,0 +1,44 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
int fd;
struct stat st;
fd = open("map", O_RDONLY);
if (!fd)
exit(101);
fstat(fd, &st);
char *map = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (!map)
exit(102);
char *s = strstr(map, argv[1]);
if (!argv[1][0] || !s) {
// default to first line
s = map;
} else {
while (*s && *s != '\n')
s++;
s++;
}
char *t = s;
while (*t && *t != '\n')
t++;
if (!*t)
exit(1);
t++;
write(1, s, t-s);
return 0;
}
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