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tag: v0.99.7a
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/*
* ident.c
*
* create git identifier lines of the form "name <email> date"
*
* Copyright (C) 2005 Linus Torvalds
*/
#include "cache.h"

#include <pwd.h>
#include <time.h>
#include <ctype.h>

static char real_email[1000];
static char real_name[1000];
static char real_date[50];

int setup_ident(void)
{
int len;
struct passwd *pw = getpwuid(getuid());

if (!pw)
die("You don't exist. Go away!");

/* Get the name ("gecos") */
len = strlen(pw->pw_gecos);
if (len >= sizeof(real_name))
die("Your parents must have hated you!");
memcpy(real_name, pw->pw_gecos, len+1);

/* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
len = strlen(pw->pw_name);
if (len > sizeof(real_email)/2)
die("Your sysadmin must hate you!");
memcpy(real_email, pw->pw_name, len);
real_email[len++] = '@';
gethostname(real_email + len, sizeof(real_email) - len);
if (!strchr(real_email+len, '.')) {
len = strlen(real_email);
real_email[len++] = '.';
getdomainname(real_email+len, sizeof(real_email)-len);
}
/* And set the default date */
datestamp(real_date, sizeof(real_date));
return 0;
}

static int add_raw(char *buf, int size, int offset, const char *str)
{
int len = strlen(str);
if (offset + len > size)
return size;
memcpy(buf + offset, str, len);
return offset + len;
}

static int crud(unsigned char c)
{
static char crud_array[256];
static int crud_array_initialized = 0;

if (!crud_array_initialized) {
int k;

for (k = 0; k <= 31; ++k) crud_array[k] = 1;
crud_array[' '] = 1;
crud_array['.'] = 1;
crud_array[','] = 1;
crud_array[':'] = 1;
crud_array[';'] = 1;
crud_array['<'] = 1;
crud_array['>'] = 1;
crud_array['"'] = 1;
crud_array['\''] = 1;
crud_array_initialized = 1;
}
return crud_array[c];
}

/*
* Copy over a string to the destination, but avoid special
* characters ('\n', '<' and '>') and remove crud at the end
*/
static int copy(char *buf, int size, int offset, const char *src)
{
int i, len;
unsigned char c;

/* Remove crud from the beginning.. */
while ((c = *src) != 0) {
if (!crud(c))
break;
src++;
}

/* Remove crud from the end.. */
len = strlen(src);
while (len > 0) {
c = src[len-1];
if (!crud(c))
break;
--len;
}

/*
* Copy the rest to the buffer, but avoid the special
* characters '\n' '<' and '>' that act as delimeters on
* a identification line
*/
for (i = 0; i < len; i++) {
c = *src++;
switch (c) {
case '\n': case '<': case '>':
continue;
}
if (offset >= size)
return size;
buf[offset++] = c;
}
return offset;
}

char *get_ident(const char *name, const char *email, const char *date_str)
{
static char buffer[1000];
char date[50];
int i;

if (!name)
name = real_name;
if (!email)
email = real_email;
strcpy(date, real_date);
if (date_str)
parse_date(date_str, date, sizeof(date));

i = copy(buffer, sizeof(buffer), 0, name);
i = add_raw(buffer, sizeof(buffer), i, " <");
i = copy(buffer, sizeof(buffer), i, email);
i = add_raw(buffer, sizeof(buffer), i, "> ");
i = copy(buffer, sizeof(buffer), i, date);
if (i >= sizeof(buffer))
die("Impossibly long personal identifier");
buffer[i] = 0;
return buffer;
}

char *git_author_info(void)
{
return get_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"));
}

char *git_committer_info(void)
{
return get_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"));
}
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