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git/strbuf.c
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#include "cache.h" | |
#include "refs.h" | |
int prefixcmp(const char *str, const char *prefix) | |
{ | |
for (; ; str++, prefix++) | |
if (!*prefix) | |
return 0; | |
else if (*str != *prefix) | |
return (unsigned char)*prefix - (unsigned char)*str; | |
} | |
int suffixcmp(const char *str, const char *suffix) | |
{ | |
int len = strlen(str), suflen = strlen(suffix); | |
if (len < suflen) | |
return -1; | |
else | |
return strcmp(str + len - suflen, suffix); | |
} | |
/* | |
* Used as the default ->buf value, so that people can always assume | |
* buf is non NULL and ->buf is NUL terminated even for a freshly | |
* initialized strbuf. | |
*/ | |
char strbuf_slopbuf[1]; | |
void strbuf_init(struct strbuf *sb, size_t hint) | |
{ | |
sb->alloc = sb->len = 0; | |
sb->buf = strbuf_slopbuf; | |
if (hint) | |
strbuf_grow(sb, hint); | |
} | |
void strbuf_release(struct strbuf *sb) | |
{ | |
if (sb->alloc) { | |
free(sb->buf); | |
strbuf_init(sb, 0); | |
} | |
} | |
char *strbuf_detach(struct strbuf *sb, size_t *sz) | |
{ | |
char *res = sb->alloc ? sb->buf : NULL; | |
if (sz) | |
*sz = sb->len; | |
strbuf_init(sb, 0); | |
return res; | |
} | |
void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc) | |
{ | |
strbuf_release(sb); | |
sb->buf = buf; | |
sb->len = len; | |
sb->alloc = alloc; | |
strbuf_grow(sb, 0); | |
sb->buf[sb->len] = '\0'; | |
} | |
void strbuf_grow(struct strbuf *sb, size_t extra) | |
{ | |
if (unsigned_add_overflows(extra, 1) || | |
unsigned_add_overflows(sb->len, extra + 1)) | |
die("you want to use way too much memory"); | |
if (!sb->alloc) | |
sb->buf = NULL; | |
ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc); | |
} | |
void strbuf_trim(struct strbuf *sb) | |
{ | |
char *b = sb->buf; | |
while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1])) | |
sb->len--; | |
while (sb->len > 0 && isspace(*b)) { | |
b++; | |
sb->len--; | |
} | |
memmove(sb->buf, b, sb->len); | |
sb->buf[sb->len] = '\0'; | |
} | |
void strbuf_rtrim(struct strbuf *sb) | |
{ | |
while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1])) | |
sb->len--; | |
sb->buf[sb->len] = '\0'; | |
} | |
void strbuf_ltrim(struct strbuf *sb) | |
{ | |
char *b = sb->buf; | |
while (sb->len > 0 && isspace(*b)) { | |
b++; | |
sb->len--; | |
} | |
memmove(sb->buf, b, sb->len); | |
sb->buf[sb->len] = '\0'; | |
} | |
struct strbuf **strbuf_split(const struct strbuf *sb, int delim) | |
{ | |
int alloc = 2, pos = 0; | |
char *n, *p; | |
struct strbuf **ret; | |
struct strbuf *t; | |
ret = xcalloc(alloc, sizeof(struct strbuf *)); | |
p = n = sb->buf; | |
while (n < sb->buf + sb->len) { | |
int len; | |
n = memchr(n, delim, sb->len - (n - sb->buf)); | |
if (pos + 1 >= alloc) { | |
alloc = alloc * 2; | |
ret = xrealloc(ret, sizeof(struct strbuf *) * alloc); | |
} | |
if (!n) | |
n = sb->buf + sb->len - 1; | |
len = n - p + 1; | |
t = xmalloc(sizeof(struct strbuf)); | |
strbuf_init(t, len); | |
strbuf_add(t, p, len); | |
ret[pos] = t; | |
ret[++pos] = NULL; | |
p = ++n; | |
} | |
return ret; | |
} | |
void strbuf_list_free(struct strbuf **sbs) | |
{ | |
struct strbuf **s = sbs; | |
while (*s) { | |
strbuf_release(*s); | |
free(*s++); | |
} | |
free(sbs); | |
} | |
int strbuf_cmp(const struct strbuf *a, const struct strbuf *b) | |
{ | |
int len = a->len < b->len ? a->len: b->len; | |
int cmp = memcmp(a->buf, b->buf, len); | |
if (cmp) | |
return cmp; | |
return a->len < b->len ? -1: a->len != b->len; | |
} | |
void strbuf_splice(struct strbuf *sb, size_t pos, size_t len, | |
const void *data, size_t dlen) | |
{ | |
if (unsigned_add_overflows(pos, len)) | |
die("you want to use way too much memory"); | |
if (pos > sb->len) | |
die("`pos' is too far after the end of the buffer"); | |
if (pos + len > sb->len) | |
die("`pos + len' is too far after the end of the buffer"); | |
if (dlen >= len) | |
strbuf_grow(sb, dlen - len); | |
memmove(sb->buf + pos + dlen, | |
sb->buf + pos + len, | |
sb->len - pos - len); | |
memcpy(sb->buf + pos, data, dlen); | |
strbuf_setlen(sb, sb->len + dlen - len); | |
} | |
void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len) | |
{ | |
strbuf_splice(sb, pos, 0, data, len); | |
} | |
void strbuf_remove(struct strbuf *sb, size_t pos, size_t len) | |
{ | |
strbuf_splice(sb, pos, len, NULL, 0); | |
} | |
void strbuf_add(struct strbuf *sb, const void *data, size_t len) | |
{ | |
strbuf_grow(sb, len); | |
memcpy(sb->buf + sb->len, data, len); | |
strbuf_setlen(sb, sb->len + len); | |
} | |
void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len) | |
{ | |
strbuf_grow(sb, len); | |
memcpy(sb->buf + sb->len, sb->buf + pos, len); | |
strbuf_setlen(sb, sb->len + len); | |
} | |
void strbuf_addf(struct strbuf *sb, const char *fmt, ...) | |
{ | |
int len; | |
va_list ap; | |
if (!strbuf_avail(sb)) | |
strbuf_grow(sb, 64); | |
va_start(ap, fmt); | |
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap); | |
va_end(ap); | |
if (len < 0) | |
die("your vsnprintf is broken"); | |
if (len > strbuf_avail(sb)) { | |
strbuf_grow(sb, len); | |
va_start(ap, fmt); | |
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap); | |
va_end(ap); | |
if (len > strbuf_avail(sb)) { | |
die("this should not happen, your snprintf is broken"); | |
} | |
} | |
strbuf_setlen(sb, sb->len + len); | |
} | |
void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn, | |
void *context) | |
{ | |
for (;;) { | |
const char *percent; | |
size_t consumed; | |
percent = strchrnul(format, '%'); | |
strbuf_add(sb, format, percent - format); | |
if (!*percent) | |
break; | |
format = percent + 1; | |
if (*format == '%') { | |
strbuf_addch(sb, '%'); | |
format++; | |
continue; | |
} | |
consumed = fn(sb, format, context); | |
if (consumed) | |
format += consumed; | |
else | |
strbuf_addch(sb, '%'); | |
} | |
} | |
size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder, | |
void *context) | |
{ | |
struct strbuf_expand_dict_entry *e = context; | |
size_t len; | |
for (; e->placeholder && (len = strlen(e->placeholder)); e++) { | |
if (!strncmp(placeholder, e->placeholder, len)) { | |
if (e->value) | |
strbuf_addstr(sb, e->value); | |
return len; | |
} | |
} | |
return 0; | |
} | |
void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src) | |
{ | |
int i, len = src->len; | |
for (i = 0; i < len; i++) { | |
if (src->buf[i] == '%') | |
strbuf_addch(dst, '%'); | |
strbuf_addch(dst, src->buf[i]); | |
} | |
} | |
size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f) | |
{ | |
size_t res; | |
size_t oldalloc = sb->alloc; | |
strbuf_grow(sb, size); | |
res = fread(sb->buf + sb->len, 1, size, f); | |
if (res > 0) | |
strbuf_setlen(sb, sb->len + res); | |
else if (oldalloc == 0) | |
strbuf_release(sb); | |
return res; | |
} | |
ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint) | |
{ | |
size_t oldlen = sb->len; | |
size_t oldalloc = sb->alloc; | |
strbuf_grow(sb, hint ? hint : 8192); | |
for (;;) { | |
ssize_t cnt; | |
cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1); | |
if (cnt < 0) { | |
if (oldalloc == 0) | |
strbuf_release(sb); | |
else | |
strbuf_setlen(sb, oldlen); | |
return -1; | |
} | |
if (!cnt) | |
break; | |
sb->len += cnt; | |
strbuf_grow(sb, 8192); | |
} | |
sb->buf[sb->len] = '\0'; | |
return sb->len - oldlen; | |
} | |
#define STRBUF_MAXLINK (2*PATH_MAX) | |
int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint) | |
{ | |
size_t oldalloc = sb->alloc; | |
if (hint < 32) | |
hint = 32; | |
while (hint < STRBUF_MAXLINK) { | |
int len; | |
strbuf_grow(sb, hint); | |
len = readlink(path, sb->buf, hint); | |
if (len < 0) { | |
if (errno != ERANGE) | |
break; | |
} else if (len < hint) { | |
strbuf_setlen(sb, len); | |
return 0; | |
} | |
/* .. the buffer was too small - try again */ | |
hint *= 2; | |
} | |
if (oldalloc == 0) | |
strbuf_release(sb); | |
return -1; | |
} | |
int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term) | |
{ | |
int ch; | |
strbuf_grow(sb, 0); | |
if (feof(fp)) | |
return EOF; | |
strbuf_reset(sb); | |
while ((ch = fgetc(fp)) != EOF) { | |
strbuf_grow(sb, 1); | |
sb->buf[sb->len++] = ch; | |
if (ch == term) | |
break; | |
} | |
if (ch == EOF && sb->len == 0) | |
return EOF; | |
sb->buf[sb->len] = '\0'; | |
return 0; | |
} | |
int strbuf_getline(struct strbuf *sb, FILE *fp, int term) | |
{ | |
if (strbuf_getwholeline(sb, fp, term)) | |
return EOF; | |
if (sb->buf[sb->len-1] == term) | |
strbuf_setlen(sb, sb->len-1); | |
return 0; | |
} | |
int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint) | |
{ | |
int fd, len; | |
fd = open(path, O_RDONLY); | |
if (fd < 0) | |
return -1; | |
len = strbuf_read(sb, fd, hint); | |
close(fd); | |
if (len < 0) | |
return -1; | |
return len; | |
} |